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Cyanotype of the Federal Telegraph Company's 500 watt transmitter used in I.T.&T.'s Broad Street (Manhattan, N.Y.) headquarters with a clear view of the Federal vacuum tube transmitter in use. Stamped "Federal Telegraph Co. Feb 8 1929 Palo Alto, Calif." on the reverse. From a binder of Federal Telegraph Company material created by Leonard Fuller circa 1965.
Federal Telegraph Company International Telephone and Telegraph Corporation Radio--Transmitters and transmission (LCSH) Vacuum-tubes (LCSH)