Edison carbon button transmitter No. 32, 1878 | Science Museum Group Collection
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Elements of acoustical engineering. Electro-acoustics; Sound. PRESSURE MICROPHONES 173 the carbon granules between the diaphragm and carbon cup without impeding the motion of the diaphragm. A displacement of the diaphragm produces
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The Carbon Microphone · Steele Vintage Broadcast Microphone Collection · UGA Special Collections Library Online Exhibitions
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Two Button Carbon Microphone (#0336) on Dec 07, 2022 | Grant Zahajko Auctions, LLC in WA
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