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English: The description of the ICAO Radiotelephony Spelling Alphabet, from the pamphlet included in an audio
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Radio Equipment, Transmitters Aircraft radio telephony transmitter (transmetteur radio telephonique ou radiotelephonique ou radio-telephonique), 1915 by
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Two-way radio Marine VHF radio Telephony Icom Incorporated, radio, electronics, electronic Device png | PNGEgg
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Aircraft radio telephony transmitter, complete with round valve and microphone, 1915 | Science Museum Group Collection
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