U.S. Special Land Stations: 1913-1921 Recap
Thomas H. White -- October 7, 2000
Effective December 13, 1912, U.S. radio stations were generally required to have government-issued licences in order to operate, and were also assigned unique callsigns, under the provisions of the Act to Regulate Radio Communication. Within the new licencing scheme, Special Land stations was an umbrella term comprising three separate licence categories -- Experimental, Technical and Training School, and Special Amateur. (The requirements for the three classifications are spelled out in the 1914 edition of Radio Communication Laws of the United States. A general overview of these stations appears in U.S. Special Land Stations: Overview.) When the first official list of licenced stations appeared on July 1, 1913, it included 22 Special Land station entries, consisting of 12 Experimental, 7 Technical and Training, and 3 Special Amateur stations.
The first letter in a Special Land station's callsign identified its licence class -- X for Experimental, Y was Technical and Training School, and Z meant Special Amateur. (A-W initial letters were assigned to regular amateur stations, which were in a completely separate licence category.) In addition, the leading number in a station's callsign designated the Radio Inspection District in which it was located. Thus, 1XE was a 1st district Experimental station (AMRAD, Medford, Massachusetts), 3YG was a 3rd district Technical and Training School station (Philadelphia School of Wireless Telegraphy), and 5ZA was a 5th district Special Amateur station (Louis Falconi in Roswell, New Mexico). If a station's licence category changed it also got a new callsign, for example, the switch from 9YN to 9XN for the University of North Dakota indicated that the licence had changed from Technical and Training School to Experimental. Also, as stations were deleted, their old callsigns were often reassigned to new stations. During World War One, all the outstanding licences expired, so all the stations had to get new ones when licencing was restored after the war. Most relicenced stations were given the same call which they had had before the war.
The Commerce Department issued an annual station list, Radio Stations of the United States, from 1913 through 1916. Publication was suspended during World War One, then restarted beginning in 1919. Quarterly supplements to the annual lists were issued through the end of 1914, then, beginning on January 1, 1915, the quarterly supplements were replaced by updates included in the Commerce Department's newly launched Radio Service Bulletin, which was issued monthly. (The Radio Service Bulletin also suspended publication during the war, following the March, 1917 issue. It restarted in August, 1919.)
The list below is a recap of basic information published about Special Land station additions, deletions, and major changes, as reported by the annual Radio Stations of the United States and supplements, plus the Radio Service Bulletin, for the period from July 1, 1913 though the end of 1921.
NOTE: Online scanned copies of Radio Service Bulletins 1 through 183 (January, 1915 through June, 1932) are available at the Federal Communication Commission's Radio Service Bulletins page.
7/1/1913 edition of Radio Stations of the United States
INITIAL "SPECIAL LAND STATION" LIST
9YI Ames, IA Iowa State Coll. of Agri. & Mechanic Arts
1XA Amesbury, MA Wireless Specialty Apparatus Co. DEL 8/1915
8XA Ann Arbor, MI University of Michigan
4XG Atlanta, GA Georgia School of Technology DEL 7/1916
9XB Beloit, WI Beloit College
6XR Berkeley, CA Frank Rieber
1XB Boston, MA Wireless Specialty Apparatus Co. DEL 12/1915
1XH Boston, MA Holtzer-Cabot Electric Co. DEL 10/1915
1YH Cambridge, MA Harvard University
1XP Cambridge, MA George W. Pierce
1XC Chelsea, MA Wm. J. Murdock Co.
8YD Detroit, MI Wm. J. Meisenheimer DEL 8/1915
9YN Grand Forks, ND University of North Dakota (later 9XN)
3XR Hyattsville, MD J. Harris Rogers
6YL Los Angeles, CA High School
2YN New York, NY Alfred Goldsmith (College City of NY) (later 2XN)
2ZH Nutley, NJ Arthur A. Hebert
3XC Philadelphia, PA Frank B. Chambers
3XJ Philadelphia, PA Saint Joseph's College
3ZS Saint Davids, PA Chas. H. Stewart
9YC Saint Louis, MO Christian Brothers College (later 9XC) DEL 3/1917
3ZH Washington, DC H. B. DeGroot
10/1/1913: Supplement No. 1 to the 7/1/1913 Radio Stations of the United States
ADDITIONS
6XS Alameda, CA Hugh R. Sprado DEL 5/1916
1XW Watchaug Pond, RI Ralph C. Watrous DEL 1/1917
1/1/1914: Supplement No. 2 to the 7/1/1913 Radio Stations of the United States
ADDITIONS
3ZR Baltimore, MD Thos. L. Richardson (later Quarantine, Curtis Bay, MD)
4YC Charleston, SC The Citadel Military Institute
1XI Gloucester, MA John Hays Hammond, Jr.
9XH Kansas City, MO (port) Harry D. Betz
4XA Key West, FL Geo. W. Almour DEL 2/1917
6XL Los Angeles, CA Y. M. C. A.
5ZD Memphis, TN C. B. De La Hunt
9ZE Minneapolis, MN Philip E. Edelman (later 9XF)
1ZO New Bedford, MA Lester I. Jenkins DEL 2/1916
2XH New York, NY Walter G. Hudson DEL 9/1916
6XC Oakland, CA Lewis Mason Clement DEL 9/1916
6XT Oakland, CA Howard H. Tremble DEL 9/1916
6YE Oakland, CA Ellery W. Stone DEL 1/1915
3ZD Riverdale, MD Frank A. DeGroot
6YS San Diego, CA Southern Electrical Co. DEL 11/1916
4XL Savannah, GA Claude A. Lewis and Manning White
2XD Slingerlands, NY Burr V. Deitz
9XD Valparaiso, IN Dodge's Institute of Telegraphy
CHANGES
2XN New York, NY -- Call changed from 2YN (Alfred Goldsmith [College City of NY])
4/1/1914: Supplement No. 3 to the 7/1/1913 Radio Stations of the United States
ADDITIONS
6XB Berkeley, CA University of California
5XC Memphis, TN Christian Brothers College DEL 9/1916
1XG Pittsfield, MA General Electric Co.
6XA San Francisco, CA Howard G. Aylsworth
6XH San Francisco, CA William W. Hanscom
3XB Tacoma Park, MD Bliss Electrical School
7/1/1914 edition of Radio Stations of the United States
ADDITIONS
3ZF Friendship Heights, MD John V. Purssell
2XM New York, NY John H. Morecroft (Columbia University)
2XT Steamship "Tyler" D. G. McCaa DEL 9/1916
2XW Summit, NJ Frank N. Waterman
CHANGES
3ZR Quarantine, Curtis Bay, MD -- City changed from Baltimore (Thomas L. Richardson)
10/1/1914: Supplement No. 1 to the 7/1/1914 Radio Stations of the United States
NOTE: I have not been able to track down a copy of this supplement. 8ZS is listed below
because is the only station, included in the 1915 edition of Radio Stations of the
United States, that was not reported in any issue of the Radio Service Bulletin.
ADDITIONS
8ZS Wilkes-Barre, PA John H. Stenger, Jr.
1/1915 Radio Service Bulletin #1 (updates to the 7/1/1914 list)
ADDITIONS
5ZI Montgomery, AL Wm. H. Amerine (Signal Corps, Ala. Nat. Guard)
6ZB Pacific Grove, CA Howard S. Bunting
3ZK Richmond, VA Frank S. Splatt (Signal Corps, Va. Nat. Guard) DEL 11/1916
2XA Schenectady, NY E. M. Kinney
CHANGES
9XN Grand Forks, ND -- Call changed from 9YN (University of North Dakota)
6YE Oakland, CA -- DELETED (Ellery W. Stone)
2/1915 Radio Service Bulletin #2 (updates to the 7/1/1914 list)
ADDITIONS
1ZC Hartford, CT Harry E. Chapman DEL 7/1916
9XK Kansas City, MO Robert R. Moore
1ZD Lexington, MA Samuel Winthrop Dean
1ZP Penikese, MA James A. B. Thomas DEL 3/1915
9ZS Springfield, IL Illinois Watch Co.
9XV Saint Louis, MO Washington University
CHANGES
2XD Slingerlands, NY -- Owner now C. F. & B. V. Deitz (Was Burr V. Deitz)
3/1915 Radio Service Bulletin #3 (updates to the 7/1/1914 list)
ADDITIONS
9YG Agricultural Coll., ND North Dakota Agricultural College
8ZX Canal Dover, OH Harry S. Weber
8ZF Cincinnati, OH Henry M. Rubel, Jr.
8YO Columbus, OH Ohio State University
1ZZ Farmington, CT David Lyon Moore DEL 9/1916
8ZU Hamilton, OH Doron Bros. Electric Co.
1ZM Hartford, CT Hiram Percy Maxim
9ZK Illiopolis, IL Harry J. E. Knotts (State-Center Record) DEL 2/1916
2XU New York, NY Peter Cooper Hewitt
1ZL Northampton, MA Dean A. Lewis (later Dean Lewis & G. C. Sabin) DEL 3/1917
8ZM Springfield, OH Ross McGregor
9YR Saint Louis, MO Saint Louis University (later 9XY)
8ZW Wheeling, WV John C. Stroebel, Jr.
CHANGES
1ZP Penikese, MA -- DELETED (James A. B. Thomas)
9XC Saint Louis, MO -- Call changed from 9YC (Christian Brothers College)
4/1915 Radio Service Bulletin #4 (updates to the 7/1/1914 list)
ADDITIONS
8YA Auburn, NY Edward L. Colby (Colby's Telegraph School)
5ZN Beeville, TX Ed. Nettelton
8ZB Buffalo, NY Nelson E. Holt
9XL Burlington, IA Leslie W. Lyon (later Wm. Peters [Burlington H.S.])
9YA Iowa City, IA State University of Iowa
8ZK Kane, PA John Fleming
2ZB Schenectady, NY Wallace L. Brooks
5/1915 Radio Service Bulletin #5 (updates to the 7/1/1914 list)
ADDITIONS
9YF Fargo, ND Theo L. Wanner
1ZT Hartford, CT Clarence D. Tuska
2XE Montauk, L. I., NY Western Electric Co.
8ZN New Castle, PA R. L. Patch
2XR New York, NY Marconi Co. DEL 9/1916
1XK Orono, ME University of Maine
9XR Rock Island, IL R. Karlowa & R. Hall (Tri-City Radio Lab.)
2XI Schenectady, NY General Electric Co.
8XW Warren, OH Goodyear Tire & Rubber Co. DEL 9/1916
9YE Wichita, KS Walter S. Ezell
6/1915 Radio Service Bulletin #6 (updates to the 7/1/1914 list)
ADDITIONS
7XU Algona, WA Universal High Power Telephone Co.
5ZQ Grand Coteau, LA Saint Charles College
8YC Ithaca, NY Cornell University (later 8XU)
9XP Lawrence, KS University of Kansas
8YI Pittsburgh, PA University of Pittsburgh
1ZP Providence, RI Ralph C. Watrous
1ZR Rockland, ME Edward L. Norton
7XK Seattle, WA Kilbourne & Clark Mfg. Co.
7XM Seattle, WA Wireless Instrument Co. DEL 9/1916
1ZW Worcester, MA Wm. H. Allison
7/1915 Radio Service Bulletin #7 (updates to the 7/1/1914 list)
ADDITIONS
2XL Aldene, NJ Marconi Co.
9YH Chicago, IL Frank S. Jones DEL 5/1916
9ZA Denver, CO Co. A, Sig. Corps, Colorado Natl. Guard
9YW Lake Geneva, WI Northwestern Military and Naval Academy
9YX Lake Geneva, WI Northwestern Military and Naval Academy
9XM Madison, WI University of Wisconsin
2XG New York, NY Radio Telephone & Telegraph Co.
2YS New York, NY William Wilson / Joseph Baier [Stuyvesant H.S. Radio Club]
2ZP Port Chester, NY John W. Hubbard
6XD San Francisco, CA Dwyer Wireless Telephone & Telegraph Co. DEL 3/1916
9ZB Trinidad, CO Co. A, Sig. Corps, Colorado Natl. Guard
8/1915 Radio Service Bulletin #8 (updates to the 7/1/1914 list)
ADDITIONS
8YP Athens, OH Ohio University
7XL Bremerton, WA T. M. Libby
9XA Rapid City, SD Claude C. Van Nuys (S.D. School of Mines)
CHANGES
1XA Amesbury, MA -- DELETED (Wireless Specialty Apparatus Co.)
8YD Detroit, MI -- DELETED (Wm. J. Meisenheimer)
9/1915 Radio Service Bulletin #9 (updates to the 7/1/1914 list)
ADDITIONS
8ZH Cincinnati, OH Clayton M. Howe (Hughes High School)
8YL Lima, OH J. E. Collins (Board of Education)
5ZM Mobile, AL Ben W. Martin
10/1915 Radio Service Bulletin #10 (updates to the 7/1/1915 list)
ADDITIONS
5YA Auburn, AL Alabama Polytechnic Institute
9XE Davenport, IA William H. Kirwan
9ZD Denver, CO Edward C. Stockman
9ZL Louisville, IL Cecil Bridges
5XM New Orleans, LA Marconi Co.
2YM New York, NY Y. M. C. A. Telegraph School
8XO Ridgway, PA W. P. Osterhout (Pittsburgh Wireless Equip. Co.)
9YB Rockford, IL Rockford School of Engineering DEL 1/1917
8ZT Tiffin, OH John J. Grossman DEL 11/1916
3YM Washington, DC McKinley Manual Training School
3YN Washington, DC James E. Smith (National Radio School)
CHANGES
1XH Boston, MA -- DELETED (Holtzer-Cabot Electric Co.)
11/1915 Radio Service Bulletin #11 (updates to the 7/1/1915 list)
ADDITIONS
8ZC Battle Creek, MI Bert E. Clough
2YU Schenectady, NY Walter L. Upson (Union College)
12/1915 Radio Service Bulletin #12 (updates to the 7/1/1915 list)
ADDITIONS
9YL Lexington, KY Otto Holstein (Co. A, Sig. Corps, Ky Natl. Guard)
8ZD Marion, OH Keith Henney
5ZB New Braunfels, TX Arthur E. Mollenhauer
6XF San Jose, CA Charles D. Herrold
9YT Wayne, NE U. S. Conn, president, State Normal School
CHANGES
1XB Boston, MA -- DELETED (Wireless Specialty Apparatus Co.)
1/1916 Radio Service Bulletin #13 (updates to the 7/1/1915 list)
ADDITIONS
1XO Cambridge, MA General Radio Co.
6XN Fruitvale, CA Natl. Wireless Telep & Teleg Co. (later Natl. Radio Co.)
8ZG Ironton, OH Henry W. Campbell
8ZI Norwalk, OH Roy C. Burr DEL 5/1916
8ZO Oberlin, OH Ross Gunn DEL 5/1916
6ZV Salt Lake City, UT Julian G. McCollom
6XO San Francisco, CA Natl. Wireless Telep & Teleg Co. (later Natl. Radio Co.)
2/1916 Radio Service Bulletin #14 (updates to the 7/1/1915 list)
ADDITIONS
9XQ Columbia, MO University of Missouri (Dept. of Physics) DEL 2/1917
1ZF Fall River, MA Harold C. Bowen
9XT Lincoln, NE Thomas C. Rice DEL 6/1916
5XO Little Rock, AR Ed Cornish
5ZF San Antonio, TX Sidney Friedrich
5ZR San Antonio, TX John C. Rodriguez
7XZ Seattle, WA University of Washington
1YK Worcester, MA Worcester Polytechnic Institute
CHANGES
9ZK Illiopolis, IL -- DELETED (Harry J. E. Knotts [State-Center Record])
1ZO New Bedford, MA -- DELETED (Lester I. Jenkins)
3/1916 Radio Service Bulletin #15 (updates to the 7/1/1915 list)
ADDITIONS
5ZC Dallas, TX Frank M. Corlett
9YU Kansas City, MO Field Co. A., Sig. Corps, Mo. Natl. Guard
7ZH La Grande, OR Orland M. Heacock DEL 3/1917
2ZE Leonia, NJ Paul F. Godley DEL 1/1917
9ZM Minneapolis, MN Marc Frazer
2ZI Montclair, NJ Alfred P. Morgan (Adams-Morgan Co.)
1ZN New Bedford, MA Milton A. Baylies
7YI Pullman, WA State College of Washington
8XE State College, PA Pennsylvania State College
5YG Waco, TX E. T. Genheimer (Waco H. S. Radio Club)
CHANGES
1ZL Northampton, MA -- Owner now Dean A. Lewis & G. C. Sabin (was Dean A. Lewis)
6XD San Francisco, CA -- DELETED (Dwyer Wireless Telephone & Telegraph Co.)
4/1916 Radio Service Bulletin #16 (updates to the 7/1/1915 list)
ADDITIONS
9YS Columbia, MO University of Missouri (School of Engineering)
5YM Fayetteville, AR University of Arkansas
2ZV Richmond Hill, NY Alfred H. Grebe
9YD University Place, NE Nebraska Wesleyan University
1ZQ Westbrook, ME Wm. H. Rocheleau
5/1916 Radio Service Bulletin #17 (updates to the 7/1/1915 list)
ADDITIONS
7ZD Bozeman, MT R. Earl Dawes
9YK Indianapolis, IN James E. Weyant (Shortridge High School)
7YS Lacey, WA Saint Martin's College
5XF Little Rock, AR Arthur R. McCreary
3XO Media, PA Simon Delbert, Jr.
8YR Oxford, OH Miami University
3XP Philadelphia, PA Simon Delbert, Jr.
CHANGES
6XS Alameda, CA -- DELETED (Hugh R. Sprado)
9XL Burlington, IA -- Owner now Wm. Peters (Burlington H.S.)(was Leslie W. Lyon)
9YH Chicago, IL -- DELETED (Frank S. Jones)
8ZI Norwalk, OH -- DELETED (Roy C. Burr)
8ZO Oberlin, OH -- DELETED (Ross Gunn)
6/1916 Radio Service Bulletin #18 (updates to the 7/1/1915 list)
ADDITIONS
1XU Cambridge, MA Cutting & Washington, Inc.
5ZH Cleveland, TN W. O. Horner
9ZF Denver, CO Co. A, Sig. Corps, Colorado Natl. Guard
8ZE Elmira, NY Harry E. Fitch
8XT Ithaca, NY Cornell University
8YW Oil City, PA Clarence M. Wickes (Electra Club) DEL 11/1916
8YZ Pittsburgh, PA Charles C. Dunning (Peabody H.S.)
5ZS Shreveport, LA Willis E. Antony
1ZS Springfield, MA George U. Readio
CHANGES
9XT Lincoln, NE -- DELETED (Thomas C. Rice)
9XY Saint Louis, MO -- Call changed from 9YR (Saint Louis University)
7/1/1916 Radio Service Bulletin #19 (updates to the 7/1/1915 list)
ADDITIONS
6ZW Bakersfield, CA Lindley Winser
1ZH Beverly Farms, MA Wilbur H. Hardy
9ZI Eldora, IA Donald R. Lewis
7ZC Lewiston, MT Arthur C. Campbell
1XS Marlboro, MA Louis Waldo Stevens
8XG Morgantown, WV C. W. Waggoner (West Virginia University)
2ZK New Rochelle, NY George C. Cannon
2ZA New York, NY New York police department
9ZP Pierre, SD Dana McNeil
8XC Pittsburgh, PA Carnegie Institute of Technology
7XE Seattle, WA Marconi Co.
9YM Stillwater, MN Fred Wood, Co. K, 3rd Infantry, Minn. Natl. Guard
7ZN Vancouver, WA George H. Wallace
3ZW Washington, DC Walther A. Parks
CHANGES
4XG Atlanta, GA -- DELETED (Georgia School of Technology)
1ZC Hartford, CT -- DELETED (Harry E. Chapman)
8/1/1916 Radio Service Bulletin #20 (updates to the 7/1/1916 list)
ADDITIONS
7ZA Hoquiam, WA Donald E. McGee
9YH Jacksonville, IL Illinois Woman's College
9YO Lamoni, IA Graceland College
6XE Monterey, CA (port) National Radio Co.
9XU Omaha, NE Union Pacific R. R. Co.
8XK Pittsburgh, PA Frank Conrad
8ZR Pottsville, PA Cotesworth M. Jackson
9ZR Rapid City, SD S. R. Halley
6ZI Salt Lake City, UT Stephen H. Besley
6XI San Francisco, CA Clarence W. Smith
9/1/1916 Radio Service Bulletin #21 (updates to the 7/1/1916 list)
ADDITIONS
2YT New York, NY Marconi Co.
6XW San Francisco, CA Eldridge Buckingham
CHANGES
1ZZ Farmington, CT -- DELETED (David Lyon Moore)
8XU Ithaca, NY -- Call changed from 8YC (Cornell University)
5XC Memphis, TN -- DELETED (Christian Brothers College)
2XH New York, NY -- DELETED (Walter G. Hudson)
2XR New York, NY -- DELETED (Marconi Co.)
2YS New York, NY -- Owner Joseph Baier[Stuyvesant H.S. Radio Club](was William Wilson)
6XC Oakland, CA -- DELETED (Lewis Mason Clement)
6XT Oakland, CA -- DELETED (Howard H. Tremble)
7XM Seattle, WA -- DELETED (Wireless Instrument Co.)
2XT Steamship "Tyler" -- DELETED (D. G. McCaa)
8XW Warren, OH -- DELETED (Goodyear Tire & Rubber Co.)
10/1/1916 Radio Service Bulletin #22 (updates to the 7/1/1916 list)
(No Special Land station changes listed)
11/1/1916 Radio Service Bulletin #23 (updates to the 7/1/1916 list)
ADDITIONS
2XK Albany, NY New York State College for Teachers
7XB Bozeman, MT Montana State College
8YW Brookville, PA Clarence M. Wickes
6XG Clayton, CA National Radio Co.
6ZF Fresno, CA Oliver M. Howard
6XU Keddie, CA National Radio Co.
6XK Las Plumas, CA National Radio Co.
8ZL Toledo, OH Willis K. Wing (Scott High School)
8XX Williamsport, PA Earl R. Thomas
CHANGES
8YW Oil City, PA -- DELETED (Clarence M. Wickes [Electra Club])
3ZK Richmond, VA -- DELETED (Frank S. Splatt [Signal Corps, Va. Nat. Guard])
6YS San Diego, CA -- DELETED (Southern Electrical Co.)
8ZT Tiffin, OH -- DELETED (John J. Grossman)
12/1/1916 Radio Service Bulletin #24 (updates to the 7/1/1916 list)
ADDITIONS
1ZI Bar Harbor, ME Arthur H. Lawford
9YV Manhattan, KS Kansas State Agricultural College
3ZO Philadelphia, PA Maynard C. Morris DEL 3/1917
6YP San Bernardino, CA Y. M. C. A.
9ZO Superior, WI F. W. Keeler
1/1/1917 Radio Service Bulletin #25 (updates to the 7/1/1916 list)
ADDITIONS
8ZJ Buffalo, NY Edward C. Wahl
8ZP Buffalo, NY W. D. Woodcock
1XW Charlestown, RI Ralph C. Watrous
9ZN Chicago, IL Ralph H. G. Mathews
5ZD Fresno, CA Robert C. Denny
2ZE Montclair, NJ Paul F. Godley
3YV University, VA University of Virginia
2XP Winfield, L. I., NY Louis G. Pacent
CHANGES
6XN Fruitvale, CA -- Owner now Natl. Radio Co. (was Natl. Wireless Telep & Teleg Co.)
2ZE Leonia, NJ -- DELETED (Paul F. Godley)
9YB Rockford, IL -- DELETED (Rockford School of Engineering)
6XO San Francisco, CA -- Owner Natl. Radio Co. (was Natl. Wireless Telep & Teleg Co.)
1XW Watchaug Pond, RI -- DELETED (Ralph C. Watrous)
2/1/1917 Radio Service Bulletin #26 (updates to the 7/1/1916 list)
ADDITIONS
1XE Medford, MA American Radio & Research Corp.
9YP Minneapolis, MN American Telegraph College
7ZR Rawson Ranch, ID Homer E. Rawson (near Kuna, ID)
3XA Roland Park, MD Louis D. Coriell
2ZL Valley Stream, NY J. Owen Smith
9ZG Woodstock, IL Sydnie A. Greenleaf
CHANGES
9XQ Columbia, MO -- DELETED (University of Missouri [Dept. of Physics])
4XA Key West, FL -- DELETED (Geo. W. Almour)
3/1/1917 Radio Service Bulletin #27 (updates to the 7/1/1916 list)
ADDITIONS
6XV Big Creek, CA Walter Burnett and Oscar Kipf
9XG Chicago, IL Austin A. Howard
9YN Culver, IN Culver Military Academy
9YJ Decatur, IL James Millikin University
7ZH Enterprise, OR Orland M. Heacock
9YQ Eureka, IL Eureka College
9YZ Greeley, CO State Teachers' College
8YV Grove City, PA Grove City College
9ZK Kansas City, MO Albert I. Graham
6ZP Phoenix, AZ Harry K. Behn, Jr.
6ZS Red Bluff, CA Herbert G. Strain
1ZK Springfield, MA Glenn C. Sabin
8ZQ Springfield, OH Charles K. Brain
CHANGES
7ZH La Grande, OR -- DELETED (Orland M. Heacock)
9XF Minneapolis, MN -- Call changed from 9ZE (Philip E. Edelman)
1ZL Northampton, MA -- DELETED (Dean A. Lewis [Dean Lewis & G. C. Sabin])
3ZO Philadelphia, PA -- DELETED (Maynard C. Morris)
9XC Saint Louis, MO -- DELETED (Christian Brothers College, originally 9YC)
4/7/1917 entry of United States into World War One
With the entry of the United States into World War One, by executive order all radio stations were either closed or taken over by the government. In addition, all the station licences listed above expired during the war.
| WORLD WAR ONE INTERREGNUM |
End of war restrictions
After the end of the war, all stations had to reapply for new licences if they wanted to return to the air. However, the November, 1919 issue of QST magazine noted that, while the inital applications were being processed: "The Radio Inspectors are authorized, however, to advise applicants what call letters they will eventually receive on their licenses and authorize them to commence operation at once, using their official call, without awaiting receipt of the actual license." Many of the returning stations were issued the same callsigns they held before the war.
6/15/1919 edition of Radio Stations of the United States
(First station list after WWI -- no Special Land station licences issued yet)
8/1/1919 Radio Service Bulletin #28 (updates to the 6/15/1919 list)
ADDITIONS
5YA College Station, TX Agricultural and Mechanical College of Texas
4YA Atlanta, GA Georgia School of Technology
9YB Agric. College, ND North Dakota Agricultural College (later 9YG)
9YA Lafayette, IN Purdue University (later 9YB)
1YA Kingston, RI Rhode Island State College DEL 11/1920
5YB Tuscaloosa, AL University of Alabama
6YA Los Angeles, CA University of Southern California
8YA Morgantown, WV West Virginia University
9/1/1919 Radio Service Bulletin #29 (updates to the 6/15/1919 list)
(No Special Land station changes listed)
10/1/1919 Radio Service Bulletin #30 (updates to the 6/15/1919 list)
ADDITIONS
3XD Baltimore, MD Johns Hopkins University
2YA Camp Dix, NJ Knights of Columbus
11/1/1919 Radio Service Bulletin #31 (updates to the 6/15/1919 list)
ADDITIONS
2ZM Clifton, NJ Lester Spangenberg
7XB Bozeman, MT Montana State College
7XD Bozeman, MT R. Earle Dawes
2XF Cliffwood, NJ Western Electric Company
2XJ Elberon, NJ Western Electric Company (later Deal Beach, NJ)
1XD Green Harbor, MA Western Electric Company
7YS Lacey, WA Saint Martins College
2XB New York, NY Western Electric Co.
2XO New York, NY Walter G. Hudson
2YT New York, NY Marconi Institute
2XN New York, NY College of the City of New York
7XZ Seattle, WA University of Washington
7ZB Vancouver, WA John B. Hertz
12/1/1919 Radio Service Bulletin #32 (updates to the 6/15/1919 list)
ADDITIONS
6XE Monterey, CA National Radio Co.
1ZC New Haven, CT A. C. Gilbert Co.
6XG San Francisco, CA National Radio Co. DEL 6/1921
6XK San Francisco, CA National Radio Co.
6XO San Francisco, CA National Radio Co. DEL 8/1920
1/2/1920 Radio Service Bulletin #33 (updates to the 6/15/1919 list)
ADDITIONS
5XA Auburn, AL Alabama Polytechnic Institute
3ZA Bala, PA Charles A. Service, Jr.
3XE Clinton, MD W. W. Conners
5ZK Franklinton, LA Paul Ellis Greenlaw
5YB Jackson, TN Young Men's Christian Association
5ZL Little Rock, AR John M. Clayton
2XS Montclair, NJ Adams Morgan Co.
1XF Providence, RI Electrical Products Manufacturing Co. DEL 12/1921
2XR Roselle Park, NJ Marconi Wireless Telegraph Co. of America
5ZA Roswell, NM Louis Falconi
6ZA Salt Lake City, UT Ira Johnston Kaar
6XJ San Francisco, CA Otis B. Moorhead
6XP San Francisco, CA Moorhead Laboratories, Inc.
2XQ Schenectady, NY Union College
5ZJ Waco, TX Henry M. Harris DEL 6/1920
2/2/1920 Radio Service Bulletin #34 (updates to the 6/15/1919 list)
ADDITIONS
5YD Agric. College, MS Mississippi Agricultural & Mechanical College
5ZU Austin, TX Wesley Hope Tilley
9ZC Baudette, MN John A. Gjelhaug
9YS Bloomington, IL Illinois Wesleyan University
7YA Boise, ID Independent School District of Boise City
1XJ Cambridge, MA Harvard University
8ZV Canton, OH Henry L. Ley
8XB Cincinnati, OH Precision Equipment Co.
8XF Cleveland, OH Emil J. Simon DEL 4/1920
8ZY Defiance, OH K. A. Duerk
8XD Detroit, MI Emil J. Simon DEL 4/1920
7ZE Elk, WY Harold P. Sheard
2XV Glenridge, NJ Western Electric Co.
5ZO Houston, TX Clifford W. Vick
5ZT Houston, TX Ingham S. Roberts III
9ZJ Indianapolis, IN Francis F. Hamilton
9YY Lincoln, NE University of Nebraska
6XY Los Altos, CA National Radio Co. DEL 8/1920
6XQ Los Angeles, CA Southern California Edison Co.
9ZL Manitowoc, WI H. J. Burhop and W. C. Bridges (later just Burhop)
8YB Manlius, NY Saint John's School DEL 11/1921
9ZT Minneapolis, MN Minnesota Wireless Association
5YC New Orleans, LA Nola Radio School
5ZP New Orleans, LA Herbert E. De Ben
2YB New York, NY B. B. Brownlee
6XX Oakland, CA Saint Mary's College DEL 9/1921
9ZQ Oelwein, IA George Raymond Hammond DEL 6/1921
2XX Ossining, NY De Forest Radio Telephone & Telegraph Co.
6XV Palo Alto, CA Federal Telegraph Co.
2XY Schenectady, NY Wallace L. Brooks
2ZC South Orange, NJ Henry L. Leeb
5YE University, MS University of Mississippi
9YD University Place, NE Nebraska Wesleyan University
3XF Washington, DC Francis Meyer Baer
3/1/1920 Radio Service Bulletin #35 (updates to the 6/15/1919 list)
ADDITIONS
6XR Auberry, CA San Joaquin Light & Power Corporation DEL 12/1920
6ZC Cochise, AZ Dr. J. B. Ellis
9YN Lawrence, KS University of Kansas DEL 7/1921
9YB Lexington, KY University of Kentucky (later 9YC)
6XC Oakland, CA National Radio Co. DEL 8/1920
6ZE San Francisco, CA D. B McGown
9ZU Sioux City, IA Sioux City Radio Laboratory
9ZV Saint Louis, MO James Albert Crowdus
CHANGES
9YG Agric. College, ND -- Call changed from 9YB (North Dakota Agricultural College)
9YB Lafayette, IN -- Call changed from 9YA (Purdue University)
4/1/1920 Radio Service Bulletin #36 (updates to the 6/15/1919 list)
ADDITIONS
3XG Baltimore, MD Edward O. Hurlburt
8ZM Buffalo, NY Cyrus H. Fraser DEL 11/1921
5YF College Station, TX Agricultural & Mechanical College of Texas
8XI Columbus, OH Ohio State University DEL 11/1921
7YB Eugene, OR University of Oregon
1YB Hanover, NH Dartmouth College
5ZW House, TX Donald Harper Graham
5ZV Houston, TX Hallet E. Worthington
5ZX Houston, TX James L. Autry, Jr. DEL 12/1920
6XD Los Angeles, CA Western Radio Electric Co.
9XI Minneapolis, MN University of Minnesota
5ZY Mulga, AL Thos. D. Sewell
9YR Muncie, IN Muncie Technical High School
2XZ New York, NY Fordham University
3YC Philadelphia, PA North East High School
8XH Pittsburgh, PA Parker Elliot Wiggin DEL 10/1921
8ZK Rochester, NY Alexander Miller Lindsay, Jr.
6XZ San Diego, CA R. O. Shelton, M.D.
3YB Savannah, GA Knights of Columbus (later 4YB)
7YC Seattle, WA Young Men's Christian Association
7YD Seattle, WA Knights of Columbus
8ZI Toledo, OH Adelbert Jacob Gogel DEL 11/1921
9ZX Valley City, ND Russell H. Pray DEL 5/1921
3YA Washington, DC Loomis Radio School
3ZB Washington, DC A. B. Brown (Bliss Electrical School)
2XH Woodmere, NY Cutting & Washington Radio Corporation
CHANGES
8XF Cleveland, OH -- DELETED (Emil J. Simon)
8XD Detroit, MI -- DELETED (Emil J. Simon)
5/1/1920 Radio Service Bulletin #37 (updates to the 6/15/1919 list)
NOTE: For some reason, this list included numerous stations already listed as additions
in earlier editions of the Radio Service Bulletin.
ADDITIONS
8XA Ann Arbor, MI University of Michigan DEL 11/1921
8YA Auburn, NY Colby's Telegraph School
3XD Baltimore, MD Johns Hopkins University
8ZC Battle Creek, MI Bert E. Clough DEL 11/1921
5ZZ Blackwell, OK Harold Schonwald
1YC Boston, MA Eastern Radio Institute
7XB Bozeman, MT Montana State College
7ZD Bozeman, MT R. Earl Dawes
1XJ Cambridge, MA Harvard University
2YA Camp Dix, NJ Knights of Columbus
9ZN Chicago, IL Ralph H. G. Mathews
2XF Cliffwood, NJ Western Electric Co.
2ZM Clifton, NJ Lester Spangenburg
5XB College Station, TX Agricultural & Mechanical College of Texas
9ZD Denver, CO Edward C. Stockman
8ZX Dover, OH Harry S. Weber
5ZN Eagle Pass, TX Ed Nettleton
2XJ Elberon, NJ Western Electric Co. (later Deal Beach, NJ)
7ZE Elk, WY Harold Prescott Sheerd
1XD Green Harbor, MA Western Electric Co.
9ZH Independence, MO Reorganized Church of Christ of Latter Day Saints
8XU Ithaca, NY Cornell University
1YA Kingston, RI Rhode Island State College
7YS Lacey, WA Saint Martin's College
5YH Little Rock, AR United States Signal Corps.
1XL Lynn, MA General Electric Co.
9XM Madison, WI University of Wisconsin
9YV Manhattan, KS Kansas State Agricultural College
9ZL Manitowoc, WI W. C. Bridges and H. J. Burhop
1ZC New Haven, CT A. C. Gilbert Co.
2ZK New Rochelle, NY George C. Cannon
2YT New York, NY Marconi Institute
2XB New York, NY Western Electric Co.
2XG New York, NY De Forest Radio Telephone & Telegraph Co.
2XO New York, NY Walter G. Hudson
3ZC Norfolk, VA City of Norfolk, Department of Public Safety DEL 8/1921
2ZH Nutley, NJ Arthur A. Hebert
8XK Pittsburgh, PA Frank Conrad
8YZ Pittsburgh, PA Peabody High School (Charles C. Dunning)
2ZL Rockville Center, NY J. Owen Smith (later Valley Stream, NY) DEL 2/1921
4XB Savannah, GA Board of Public Education
2XA Schenectady, NY E. M. Kinney
7XZ Seattle, WA University of Washington
5ZS Shreveport, LA William E. Antony
9ZS Springfield, IL Illinois Watch Co.
1ZK Springfield, MA Glenn C. Sabin DEL 11/1920
5XD State College, NM New Mexico College
8XE State College, PA Pennsylvania State College DEL 11/1921
9XD Valparaiso, IN Dodge's Institute of Telegraphy
7ZB Vancouver, WA John D. Hertz
3XH Washington, DC Lester Stewart Barr
9YT Wayne, NE State Normal School
8ZW Wheeling, WV John C. Stroebel, Jr.
8ZS Wilkes-Barre, PA John H. Stenger, Jr.
CHANGES
9YC Lexington, KY -- Call changed from 9YB (University of Kentucky)
6/1/1920 Radio Service Bulletin #38 (updates to the 6/15/1919 list)
CHANGES
5ZJ Waco, TX -- DELETED (Henry M. Harris)
7/1/1920 Radio Service Bulletin #39 (updates to the 6/15/1919 list)
ADDITIONS
7ZG Bear Creek, MT Winfred E. Slauson
2XT Brooklyn, NY Lowenstein Radio Co.
7YF Burley, ID Burley High School
5XE Burrwood, LA Tropical Radio Telegraph Co.
1XM Cambridge, MA Massachusetts Institute of Technology
8ZJ Cincinnati, OH Hughes High School DEL 11/1921
8XD Dearborn, MI Henry Ford DEL 9/1920
8ZN Detroit, MI George W. Carter
6XU Fresno, CA San Joaquin Light & Power Corporation DEL 12/1920
5YI Houston, TX Rice Institute
9ZZ Kansas City, MO Walter M. Aronson and Albert R. Perkins DEL 9/1921
9ZY La Crosse, WI Ben A. Ott
8XJ Lewisburg, PA Bucknell University DEL 11/1921
6ZG Los Angeles, CA Forbes W. Van Why
5ZJ Mesilla Park, NM R. W. Goddard
1XN Middletown, CT Walter G. Cady (later Wesleyan University)
3YD Norfolk, VA Norfolk Radio School DEL 7/1921
8XL Northville, MI Henry Ford DEL 9/1920
9YP Omaha, NE High School of Commerce
3XI Philadelphia, PA Lester H. Damon
8ZO Pittsburgh, PA Frank Moore, Jr. DEL 11/1921
7YG Portland, OR Young Men's Christian Association
7ZI Portland, OR Charles L. Austin
6XT San Francisco, CA Baruch Research Laboratories
6XS San Gabriel, CA R. B. Ashbrook
7XK Seattle, WA Kilbourne & Clark Manufacturing Co.
7YE Seattle, WA City of Seattle School District (Broadway High Schoool)
3YE Staunton, VA Staunton Military Academy
9XJ Urbana, IL University of Illinois
8/2/1920 Radio Service Bulletin #40 (updates to the 6/30/1920 list)
ADDITIONS
9YE Chicago, IL Tilden Technical High School
9YH Evanston, IL Evanston High School
CHANGES
4YB Savannah, GA -- Call changed from 3YB (Knights of Columbus)
6XY Los Altos, CA -- DELETED (National Radio Co.)
6XC Oakland, CA -- DELETED (National Radio Co.)
6XO San Francisco, CA -- DELETED (National Radio Co.)
9/1/1920 Radio Service Bulletin #41 (updates to the 6/30/1920 list)
ADDITIONS
1XR Belfast, ME International Radio Telegraph Co.
lYS Boston, MA Massachusetts Radio and Training School
9YL Chicago, IL Armour Institute of Technology
8XC Cleveland, OH Glenn L. Martin Co. DEL 4/1921
9YQ Culver, IN Culver Military Academy
8YE Detroit, MI Case Technical High School DEL 11/1921
5YJ New Orleans, LA Knights of Columbus
3YF Philadelphia, PA Pennsylvania-Marconi Wireless School
1XQ Rockland, ME International Radio Telegraph Co. DEL 9/1921
9YK Saint Louis, MO Saint Louis University
2XO Yonkers, NY Walter G. Hudson
CHANGES
8XD Dearborn, MI -- DELETED (Henry Ford)
8XL Northville, MI -- DELETED (Henry Ford)
10/1/1920 Radio Service Bulletin #42 (updates to the 6/30/1920 list)
ADDITIONS
5ZD Alexandria, LA Frank B. Beuhler
4XC Atlanta, GA B. W. Benning
3ZF Bethesda, MD John V. Purssell
8ZH Cincinnati, OH East High School DEL 11/1921
8XD Dearborn, MI Henry Ford
8XR Detroit, MI Detroit Edison Co. DEL 4/1921
8ZQ Dunmore, PA Roy C. Ehrhardt
3ZI Hagerstown, MD Roy C. Corderman
1XV Hartford, CT C. D. Tuska Co. DEL 9/1921
5ZC Houston, TX B. J. Still (later 5ZE)
8ZF Lansing, MI Maurice H. Pancost
6XN Los Angeles, CA A. H. McClelland, J. B. Farrington, and A. A. Kluge
8ZE Marietta, OH Norman A. Thomas and Edward Manley DEL 11/1921
8ZT Marietta, OH George M. Withington, Jr.
4XD Mecklenburg, NC F. M. Laxton
5YK New Braunfels, TX Edgar A. Sahm
8ZA New Philadelphia, OH Charles J. Murray
2XD New York, NY Ware Radio Co. (later Hoboken, NJ)
8XL Northville, MI Henry Ford
3XJ Philadelphia, PA Saint Joseph's College
3YG Philadelphia, PA Philadelphia School of Wireless Telegraphy
3ZG Philadelphia, PA Allyn E. Seuffert
3ZJ Philadelphia, PA Maj. J. H. Clinton
5ZB Pilot Point, TX Clyde S. Mosteller
8XN Pittsburgh, PA Carnegie Institute of Technology Radio Club DEL 11/1921
8ZD Pittsburgh, PA Burton P. Williams (later Parker Elliot Wiggin)
2ZE Port Chester, NY Paul F. Godley
8XP Port Huron, MI Detroit Edison Co. DEL 4/1921
7XA Portland, OR Radio Corp. of America
1XX Providence, RI Brown University (Physics Department)
6ZJ Redlands, CA Arthur L. Munzig
6ZH Richfield, UT Wesley C. Thompson
2XE Richmond Hill, NY A. H. Grebe & Co.
2ZV Richmond Hill, NY A. H. Grebe & Co.
8ZG Salem, OH A. J. Manning
6ZB San Diego, CA Dr. Alfred E. Banks
6XC San Francisco, CA Lee de Forest, Inc. (later Pacific Radio Supplies Co.)
6XE San Jose, CA (portable)Charles D. Herrold
7XC Seattle, WA Vincent I. Kraft
1XT South Manchester, CT John L. Reinartz
6ZK Sunnyvale, CA Arthur E. Bessey
8XQ Superior, MI Detroit Edison Co. DEL 4/1921
8ZB Toledo, OH Earl S. Ensign and Willlam P. Van Behren
7ZG Vancouver, WA Royal Mumford
5ZF Waco, TX Henry M. Harris
3XL Washington, DC ALfred Crossley
3ZE Washington, DC Harold A. Snow
2ZD Woodside, NY Ship Owners' Radio Service
6ZL Yuma, AZ Alexander N. Marquis
CHANGES
1XN Middletown, CT -- Change owner to Wesleyan University (was Walter G. Cady)
11/1/1920 Radio Service Bulletin #43 (updates to the 6/30/1920 list)
ADDITIONS
8YF Alderson, WV Camp Greenbrier
4YA Atlanta, GA Georgia School of Technology
8ZP Cleveland, OH Edward I. Deighan
1XY Hampton, NH DeLancey Felch & Co.
1XH New Haven, CT Yale University
2XN* New York, NY College of the City of New York
3XC* Philadelphia, PA Frank B. Chambers
8XO Ridgway, PA Pittsburgh Wireless Equipment Co. DEL 11/1921
3ZS* Saint Davids, PA Charles H. Stewart
3YV University, VA University of Virginia
* Omitted from List of Commercial and Government Stations, edition June 30, 1920.
CHANGES
1YA Kingston, RI -- DELETED (Rhode Island State College)
1ZK Springfield, MA -- DELETED (Glenn C. Sabin)
12/1/1920 Radio Service Bulletin #44 (updates to the 6/30/1920 list)
ADDITIONS
3YH Baltimore, MD Young Men's Christian Association Radio School
8YJ Detroit, MI George W. Carter
9ZB Dubuque, IA Clifford W. Patch
8YG East Lansing, MI Michigan Agricultural College
8ZZ Highland Park, MI Clyde E. Darr
8XS Lansing, MI Wilcox Laboratories
8ZR Mansfield, MI Radio Club of Mansfield
8YH Morgantown, WV West Virginia University
8YR Oxford, OH Miami University
6ZM Salt Lake City, UT The Deseret News
2XI Schenectady, NY General Electric Co.
8ZL Saint Marys, OH Charles Candler
7ZK Vancouver, WA Vernon J. Bird
9YB West Lafayette, IN Purdue University
CHANGES
6XR Auberry, CA -- DELETED (San Joaquin Light & Power Corporation)
2XJ Deal Beach, NJ -- City changed from Elberon, NJ (Western Electric Co.)
6XU Fresno, CA -- DELETED (San Joaquin Light & Power Corporation)
5ZX Houston, TX -- DELETED (James L. Autry, Jr.)
1/3/1921 Radio Service Bulletin #45 (updates to the 6/30/1920 list)
ADDITIONS
9YI Ames, IA Iowa State College
7XB Bozeman, MT Montana State College
9YM Columbia, MO University of Missouri
5ZC Dallas, TX Frank M. Corlett
5ZG Dallas, TX Bennett Emerson DEL 9/1921
8YK Delaware, OH Ohio Wesleyan University
4ZA Greensboro, NC James R. Wikle
5ZX Houston, TX Alfred P. Daniel
3ZM Media, PA Simon Deibert, Jr.
2XK New York, NY L. M. Cockaday & Co. (later Superadio Corporation)
2XP New York, NY Radio Corporation of America
2XU New York, NY Samuel E. Adair
3YI Philadelphia, PA Knights of Columbus School
7XD Polytechnic, MT Billings Polytechnic Institute
9YW Rapid City, SD South Dakota State School of Mines
3ZL Richmond, VA Clay D. Blair
6ZN San Fernando, CA B. H. Dennis and C. A. Taylor
5ZH Sanford, FL Clarence M. Wickes
6XO San Francisco, CA National Radio Co. DEL 5/1921
9XS Saint Louis, MO Manhattan Electrical Supply Co.
9ZB Saint Louis, MO Lester A. Benson
7ZL Tacoma, WA Anton R. Tingstad
2ZL Valley Stream, NY J. Owen Smith
2/1/1921 Radio Service Bulletin #46 (updates to the 6/30/1920 list)
ADDITIONS
4YJ Atlanta, GA Knights of Columbus School
9XX Belleville, IL Chas. B. Harrison
6ZR Burlingame, CA Hall Berringer (later Los Angeles, CA)
9XT Collegeville, MN Saint Johns University
9XW Gatesburg, IL Lombard College
1XE Medford, MA American Radio and Research Corp.
3ZO Parkesburg, PA Horace A. Beale, Jr.
3XM Princeton, NJ David Richardson
6ZO Reno, NV Hadley S. Beddle
9XZ Urbana, IL Paul G. Busey
CHANGES
2ZL Rockville Center, NY -- DELETED (J. Owen Smith -- now Valley Stream, NY)
3/1/1921 Radio Service Bulletin #47 (updates to the 6/30/1920 list)
(No Special Land station changes listed)
4/1/1921 Radio Service Bulletin #48 (updates to the 6/30/1920 list)
ADDITIONS
9ZAC Anthony, KS Perry E. Thurman
8ZN Ashland, OH J. W. Kauffman
4ZB Atlanta, GA Georgia Railway & Power Co.
6XAD Avalon, CA Lawrence Mott
5ZAC Baton Rouge, LA Wilmer L. Barrow
8YN Battle Creek, MI Battle Creek High School
6XK Berkeley, CA Bernard F. McNamee
6XM Berkeley, CA University of California
3XN Blacksburg, VA Virginia Polytechnic Institute
8YQ Buffalo, NY Independent Wireless Telegraph Co.
8XY Cincinnati, OH Cino Radio Mfg. Co. DEL 11/1921
8YS Cincinnati, OH University of Cincinnati
9ZAA Clarinda, IA Farmers Mutual Telephone Co.
5XG Dallas, TX Frank M. Corlett
9XE Davenport, IA William H. Kirwan
6ZZ Douglas, AZ Harry L. Gooding
5XJ Dublin, TX Guy W. Neel
5ZAD El Paso, TX A. Le Roy Hill
9YAA Emporia, KS College of Emporia
4ZN Fort Pierce, FL Otis Atlee Gulledge
6ZU Fresno, CA Lloyd E. Martin
4ZC Gainesville, FL University of Florida
8YM Granville, OH Richard H. Howe
5ZAB Houma, LA Francis L. Pullen
5ZAA Houston, TX Francis M. Austin
9ZAD Independence, MO George S. Turner
2XAD Jersey City, NJ Ship Owners Radio Service
5ZW Juliff, TX Donald Harper Graham
9XAB Kansas City, MO McCreary Radio Supply Co.
9ZAB Kearney, NE S. L. Keller
5XK Knoxville, TN Philip Stout
2XW Lancaster (tugboat) Pennsylvania R. R. Co.
9YAE Le Mars, IA Western Union College
3YK Lexington, VA Virginia Military Institute
6XAC Los Altos, CA Colin B. Kennedy Co.
9YAD Milwaukee, WI School of Engineering of Milwaukee
7ZM Moscow, ID Jack Woodworth
5XH New Orleans, LA Tropical Radio Telegraph Co.
2XAF New York, NY International Radio Telegraph Co.
2XAG New York, NY Ware Radio Co. DEL 10/1921
2XC New York, NY Ware Radio Co.
2YM New York, NY East Side Y. M. C. A.
9XAA Omaha, NE Cramer and Swain
9XAD Ottumwa, IA William W. Harper
9YAF Pembina, ND Pembina High School
3ZQ Philadelphia PA Stanley C. Bryce
8YI Pittsburgh, PA University of Pittsburgh
7ZB Portland, OR John D. Hertz DEL 6/1921
2XAA Port Richmond, NY Radio Corporation of America
9XAC Rock Island, IL Karlena Radio Corporation
3ZP Richmond, VA Ralph R. Chappell
6ZT Salt Lake City, UT Art Johnson
6XAA San Francisco, CA Pacific Telephone & Telegraph Co.
6XAB San Francisco, CA Colin B. Kennedy Co.
6XF San Jose, CA Chas. D. Herrold
6ZY Santa Barbara, CA Frederick C. Roebuck DEL 7/1921
2XAB Sisco No. 4 (tugboat) Radio Corporation of America
5XI South San Antonio, TX George H. Burgess
9YAB Saint Louis, MO Washington University
9YAC Superior, WI State Normal School
6ZX Walnut Grove, CA J. V. Wise
3XQ Washington, DC Robert H. Worrall
3ZW Washington, DC Walther A. Parks
3ZT Whitford, PA George Thomas
9XAE Wichita, KS Cosradio Co.
2XP Winfield, NY Louis G. Pacent
2XAC Woodside, NY Ship Owners Radio Service
1XZ Worcester, MA Clark University
CHANGES
8XC Cleveland, OH -- DELETED (Glenn L. Martin Co.)
5ZC Dallas, TX -- Call changed from 5ZE (Frank M. Corlett)
8XR Detroit, MI -- DELETED (Detroit Edison Co.)
5ZE Houston, TX -- Call changed from 5ZC (B. J. Still)
9ZL Manitowoc, WI -- Owner change to H. J. Burhop (was H. J. Burhop and W. C. Bridges)
8XP Port Huron, MI -- DELETED (Detroit Edison Co.)
8XQ Superior, MI -- DELETED (Detroit Edison Co.)
5/2/1921 Radio Service Bulletin #49 (updates to the 6/30/1920 list)
ADDITIONS
8YT Alliance, OH Mount Union College
5ZAG Austin, TX George E. Endress
3ZU Baltimore, MD Southern Wireless Institute
5ZAH Biloxi, MS Hubert S. Ogden
9YAG Bloomington, IN Indiana University
7ZO Casper, WY Norman R. Hood
8YX Cincinnati, OH University of Cincinnati
8XV Cleveland, OH Frederick S. McCullough (later Pittsburgh, PA)
7YJ Corvallis, OR Oregon Agricultural College
8YU Dayton, OH Young Men's Christian Association
9XAG Denver, CO Harry H. Buckwalter
3YO Easton, PA Lafayette College
9ZX Ellendale, ND H. J. Goddard and F. S. Leavenworth
3ZV Norristown, PA Samuel W. Place
6XAF Oakland, CA Pacific Telephone & Telegraph Co. (later Piedmont, CA)
9XAF Peoria, IL Bradley Institute
7YH Portland, OR Washington High School
5ZAE San Antonio, TX Leavell D. Wall
6XAE San Francisco, CA The Radio Telephone Shop
6ZAA San Jose, CA E. Garratt Arnold
7XJ Seattle WA Charles W. Peterson
8ZAA Springfield, OH J. Warren Wright
5YL Thibodaux, LA Thibodaux High School
3YP Villanova, PA Villanova College
5ZAF Waco, TX William P. Clarke
3YL Washington, DC Knights of Columbus Service School
CHANGES
6XO San Francisco, CA -- DELETED (National Radio Co.)
9ZX Valley City, ND -- DELETED (Russell H. Pray)
6/1/1921 Radio Service Bulletin #50 (updates to the 6/30/1920 list)
ADDITIONS
4ZD Asheville, NC Piedmont Electric Co.
9XAJ Bedford, IA Bedford Light, Heat & Power Co.
4XE Buena Vista, GA William B. Short
3YQ Camden, NJ Federal Institute of Radio Telegraphy
4XD Charlotte NC F. M. Laxton
9XG Chicago, IL Austin A. Howard
9XAH Evansville, IN Ideal Apparatus Co.
9XAI Golden, CO Colorado School of Mines
8XZ Forest Hills, PA Harry M. Ryder
9YAH Gunnison, CO Colorado State Normal School
9YAI Lexington, KY Transylvania University
6ZAC Lihue, HI Clifford J. Dow
6YA Los Angeles, CA Young Men's Christian Association
1ZE Marion, MA Irving Vermilya
5XL Memphis, TN William B. Stieg
2XNA New York, NY City College Radio Club
2XNB New York, NY Townsend Harris Hall Radio Club
1XAA Noroton Heights, CT Percival E. Fansler
9YAJ Northfield, MN Saint Olaf College
3XS Philadelphia, PA George W. Carns
7XF Portland, OR Northwestern Radio Manufacturing Co.
7YK Portland, OR Benson Polytechnic School
7ZB Portland, OR William A. Leidigh, Jr.
3XU Princeton, NJ Walter V. Roberts
9ZAE Richmond, IN Palladium Printing Co.
6XG San Francisco, CA Leo J. Meyberg Co.
6ZAB San Francisco, CA S. Peterson and Hal Shaw
CHANGES
9ZQ Oelwein, IA -- DELETED (George Raymond Hammond)
7ZB Portland, OR -- DELETED (John D. Hertz)
6XG San Francisco, CA -- DELETED (National Radio Co.)
7/1/1921 Radio Service Bulletin #51 (updates to the 6/30/1920 list)
ADDITIONS
1XAB Cambridge, MA Clapp-Eastham Co.
3ZX Lexington, VA Harry M. Quisenberry
6ZAD Napa, CA J. J. Mahler, Jr.
6ZAE Oakland, CA Chris F. Eiferle
7ZP Olympia, WA Edwin W. Wilson
3XV Philadelphia, PA Thomas Appleby
8XM Pittsburgh, PA Phillips Thomas
5XP San Antonio, TX E. M. Baker
5ZAI San Antonio, TX R. C. Walker (later 5ZAK)
5ZR San Antonio, TX John C. Rodriguez
7YL Spokane, WA North Central High School
6XAG Sunnyvale, CA The Radio Shop
1YK Worcester, MA Worcester Polytechnic Institute
CHANGES
9YN Lawrence, KS -- DELETED (University of Kansas)
2XK New York, NY -- Owner now Superadio Corporation (was L. M. Cockaday & Co.)
3YD Norfolk, VA -- DELETED (Norfolk Radio School)
6ZY Santa Barbara, CA -- DELETED (Frederick C. Roebuck)
8/1/1921 Radio Service Bulletin #52 (updates to the 6/30/1920 list)
ADDITIONS
5YN Abliene, TX Simmons College
3YR Baltimore, MD Polytechnic Institute, city of Baltimore
6ZAF Berkeley, CA A. H. Babcock
1XO Cambridge, MA General Radio Co.
9YAK Chicago, IL City of Chicago
8XAA Cincinnati, OH Crosley Manufacturing Co.
9ZAF Denver, CO Wm. D. Reynolds
5ZAJ Kountze, TX Arthur H. Holt
1XAC Middletown, CT Wesleyan University
5XQ New Orleans, LA Pendleton E. Lehde
6XAJ Oakland, CA Preston D. Allen
3XW Parkesburg, PA Horace A. Beale, Jr.
1XAD Pawtucket, RI Standard Radio & Electric Co.
7ZT Portland, OR G. B. Criteser
7ZS Pullman, WA Hugh E. Allen
6ZAG San Francisco, CA Clyde C. Young
6ZAH San Francisco, CA Boy Scouts of America
6ZAI San Francisco, CA Boy Scouts of America
4ZE Spring Glen, FL James C. Kellow
3XZ Washington, DC Radio Construction Co.
3ZY Washington, DC Lawrence M. Dunnan
CHANGES
3ZC Norfolk, VA -- DELETED (City of Norfolk, Department of Public Safety)
9/1/1921 Radio Service Bulletin #53 (updates to the 6/30/1921 list)
ADDITIONS
3XAA Baltimore, MD E. Craig Densten
3XT Baltimore, MD R. Selway Collmus (later Louis E. Richwien)
3XX Baltimore, MD Louis E. Richwien (later R. Selway Collmus)
8XAB Detroit, MI City of Detroit, Police Department
7ZH Enterprise, OR Orland M. Heacock
5XS Houston, TX Tel Electric Co.
9XK Kansas City, MO Robert R. Moore
5XR Montgomery, AL S. G. F. Rathborne
3XY Norfolk, VA R. L. Hopkins and H. L. Buskey
CHANGES
6ZR Burlingame, CA -- Change city to Los Angeles, CA (Hall Berringer)
5ZG Dallas, TX -- DELETED (Bennett Emerson)
1XV Hartford, CT -- DELETED (C. D. Tuska Co.)
9ZZ Kansas City, MO -- DELETED (Walter M. Aronson and Albert R. Perkins)
6XX Oakland, CA -- DELETED (Saint Mary's College)
1XQ Rockland, ME -- DELETED (International Radio Telegraph Co.)
5ZAK San Antonio, TX -- Call changed from 5ZAI (R. C. Walker)
6XC San Francisco, CA -- Owner to Pacific Radio Supplies Co.(was Lee de Forest, Inc.)
10/1/1921 Radio Service Bulletin #54 (updates to the 6/30/1921 list)
ADDITIONS
3ZN Baltimore, MD Harold A. Hogan
3XAB Charlottesville, VA Virginia Radio Co.
3ZZ Cradock, VA Aloysius A. Kubiac
5ZAM Commerce, TX Arthur C. West
4ZF Decatur, GA Thurston Hatcher
5YM Fayetteville, AR University of Arkansas
5XU Austin, TX University of Texas
6XAK Los Angeles, CA Leo J. Meyberg Co.
6XAL Oakland, CA Alfred H. Cohen
6XAM Oakland, CA Stafford W. Warner
5XT Oklahoma City, OK Oklahoma Radio Shop
1XAE Springfield, MA Westinghouse Electric & Manufacturing Co.
3YN Washington, DC National Radio Institute
9YAK Yankton, SD Yankton College
CHANGES
2XAG New York, NY -- DELETED (Ware Radio Co.)
8XH Pittsburgh, PA -- DELETED (Parker Elliot Wiggin)
11/1/1921 Radio Service Bulletin #55 (updates to the 6/30/1921 list)
ADDITIONS
1XAF Boston, MA Edison Electric Illuminating Co. of Boston
1XAG Boston, MA (portable) Edison Electric Illuminating Co. of Boston
9XAM Chicago, IL City of Chicago, Dept. of Electricity
9XAN Chicago, IL City of Chicago
8YO Columbus, OH Ohio State University
9YAL Denver, CO Y. M. C. A., Radio Telegraph and Telephone School
6XU Fresno, CA San Joaquin Light & Power Co.
9YA Iowa City, IA State University of Iowa
6XAO Los Angeles, CA Arno A. Kluge
9XAO Minneapolis, MN Northern States Power Co.
7ZU Polytechnic, MT Glen E. West
8ZAB Scranton, PA Shotten Radio Manufacturing Co.
6XH Stanford Univ., CA Herbert Hoover, Jr.
7ZJ Vancouver, WA Royal Mumford
CHANGES
3XT Baltimore, MD -- Owner now Louis E. Richwien (was R. Selway Collmus)
3XX Baltimore, MD -- Owner now R. Selway Collmus (was Louis E. Richwien)
8XV Pittsburgh, PA -- City changed from Cleveland, OH (Frederick S. McCullough)
6XAF Piedmont, CA -- City changed from Oakland, CA (Pacific Telephone & Telegraph Co.)
8ZD Pittsburgh, PA -- Owner now Parker Elliot Wiggin (was Burton P. Williams)
8XA Ann Arbor, MI -- DELETED (University of Michigan)
8ZC Battle Creek, MI -- DELETED (Bert E. Clough)
8ZM Buffalo, NY -- DELETED (Cyrus H. Fraser)
8XY Cincinnati, OH -- DELETED (Cino Radio Mfg. Co.)
8ZH Cincinnati, OH -- DELETED (East High School)
8ZJ Cincinnati, OH -- DELETED (Hughes High School)
8XI Columbus, OH -- DELETED (Ohio State University)
8YE Detroit, MI -- DELETED (Case Technical High School)
8XJ Lewisburg, PA -- DELETED (Bucknell University)
8YB Manlius, NY -- DELETED (Saint John's School)
8ZE Marietta, OH -- DELETED (Norman A. Thomas and Edward Manley)
8XN Pittsburgh, PA -- DELETED (Carnegie Institute of Technology Radio Club)
8ZO Pittsburgh, PA -- DELETED (Frank Moore, Jr.)
8XO Ridgway, PA -- DELETED (Pittsburgh Wireless Equipment Co.)
8XE State College, PA -- DELETED (Pennsylvania State College)
8ZI Toledo, OH -- DELETED (Adelbert Jacob Gogel)
12/1/1921 Radio Service Bulletin #56 (updates to the 6/30/1921 list)
ADDITIONS
4XF Atlanta, GA Charles L. Pierce
4XH Atlanta, GA H. E. Bussey
8ZAC Barnesville, OH Clifford H. Galloway
3ZAA Buena Vista, VA J. Frank Kay
8XAD Buffalo, NY Federal Telephone & Telegraph Co.
8YV Grove City, PA Grove City College
6XAP Honolulu, HI Radio Shop
5ZAN Laredo, TX Charles G. Clark
8YAA Marietta, OH Marietta College
8ZAD Mayville, NY Experimental Radio Association
1YD Northfield, VT Norwich University
6XW Oakland, CA Richard C. Tavers
1XAH Orono, ME University of Maine
3XAC Philadelphia, PA Ship Owners Radio Service
6ZAJ Richfield, UT M. S. Andelin
3ZAB Roanoke, VA Charles L. Zimmerman
8XAC Toledo, OH William B. Duck Co.
6ZAK Yuma, AZ Charles E. Blalack
CHANGES
2XD Hoboken, NJ -- City changed from New York, NY (Ware Radio Co.)
1XF Providence, RI -- DELETED (Electrical Products Manufacturing Co.)