Thomas Edison - Wikipedia
March 4, 1877: The Microphone Sounds Much Better | WIRED
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Microphones
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Vintage THOMAS A EDISON -ELECTRIC VOICEWRITER model ME-E W/ RECORD & MICROPHONE | eBay
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No. 2949: Microphone
Thomas Edison | Biography, Early Life, Inventions, & Facts | Britannica
March 4, 1877: The Microphone Sounds Much Better | WIRED
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