Jet romantico Cinque radio telephony leva Principe Eccezionale
Radio Equipment, Transmitters Aircraft radio telephony transmitter (transmetteur radio telephonique ou radiotelephonique ou radio-telephonique), 1915 by
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Aircraft radio telephony transmitter, complete with round valve and microphone, 1915 | Science Museum Group Collection
Aircraft radio telephony transmitter together with microphone, less Round valve | Science Museum Group Collection