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History of Communications-Electronics in the United States Navy, Captain Linwood S. Howeth, USN (Retired), 1963, page 576:

Appendix  I.  The  U.  S.  Navy  Type  Number  System

In 1916 the Navy adopted a Type Number System to identify radio equipment by the designing agency's assigned designation as listed below:
 

CA	American Radio Research Corp.	CAD	Domestic Manufacturing Engineering Co.
CB	Crocker Wheeler Co.	CAE	Cutler Hammer Manufacturing Co.
CD	Dubilier Condenser Co.	CAF	John Firth
CE	E. J. Simon	CAG	General Radio Co.
CF	de Forest Radio Telephone & Telegraph Co.	CAH	Cutter Manufacturing Co.
CG	General Electric Co.	CAJ	Holtzer Manufacturing Co.
CH	Electrose Insulator Co.	CAK	William J. Murdock
CK	Kilbourne and Clark	CAL	Locke Insulator Co.
CL	Fritz Lowenstein	CAM	Manhattan Electrical Supply Co.
CM	Marconi Wireless Telegraph Co. of America	CAN	Sagame Electric Co.
CN	National Electric Supply Co.	CAD	Ward Leonard Co.
CO	Copely Manufacturing Co.	CAP	Frank B. Perry
CP	Cutting and Washington	CAQ	Robbins and Meyers
CQ	International Radio Telegraph Co.	CAR	Roller Smith
CR	Wireless Specialty Apparatus Co.	CAS	Chloride of Silver Co.
CS	Sperry Manufacturing Co.	CAT	American Transformer Co.
CT	Federal Telegraph Co.	CAU	Triumph Electric Co.
CU	Miller Resse Hutchinson	CAW	C. & C. Electric Co.
CV	Weston Instrument Co.	CAX	Metropolitan Electric Co.
CW	Western Electric Co.	CAV	Industrial Controller Co.
CY	Wireless Improvement Co.	CAY	West Electric Controller Co.
CAB	Baldwin Telephone Co.	SE	Bureau of Engineering
CAC	Central Telephone Co.

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