The Jewelers' Circular
, May 12, 1920, page 148:
First Come
We Install
First Served
The DeForest Radio Time Receiver
For Jewelers.
Now in Commercial Use.
For Terms
Write or Wire.
RADIO INSTALLATION COMPANY
(Radio News & Music Inc.)
165 West 31st St., New York City
United States Early Radio History
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Broadcasting After World War One
>
Post-War Experimentation and Development