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The range of the device is limited and although talking from room to room, the sounds of the machine’s crackling made by the mannequin made dialogue very difficult. German Shorthaired Pointer Knowledge Poster. After two years of research, Edison invented the microphone, completed a transmetteur using a charcoal bar and succeeded in transmitting voice over 225 kilometers of line. Edison made the intensity of voice through the phone much greater and the sound became clear. Western Union acquired the patent for the transmitter for $ 100,000. Edison’s success in improving telephones led people to say that “Bell invented the telephone but it was thanks to Edison that the telephone became useful.
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