Which inventor improved the early telephone by developing the carbon microphone transmitter in 1877?
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Thomas Edison invented the carbon transmitter, which used compressed carbon granules to vary electrical resistance. This made the telephone signal strong enough for long-distance calls. Bell's original magneto transmitter was far too weak, limiting calls to very short distances. Photo: No machine-readable author provided. Gerry Ashton assumed (based on copyright cl, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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