U.S. Chief Signal Officer using new radio

February 8, 1928 - U.S. Chief Signal Officer using new radio equipment for talking to aviators in flight. The new aircraft-radio equipment permits both radiotelephone and radiotelegraph communication, sending, receiving, at the same time

1920 1929 1920-1929 Fieldwork Garage Headset Intelligence Message Morse Operating Operators Radiotelegraphy Sending Supervisor Telecommunications Transceiver Transmitting Wireless

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