Aircraft radio telephony transmitter, complete with round valve and microphone, 1915 | Science Museum Group Collection
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Aircraft radio telephony transmitter, complete with round valve and microphone, 1915 | Science Museum Group Collection
In World War I, British Biplanes Had Wireless Phones in the Cockpit - IEEE Spectrum
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Radiotelephone - Wikipedia
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Aircraft radio telephony transmitter together with microphone, less Round valve | Science Museum Group Collection
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RTR (Radio Telephony Restricted)
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