Carbon microphone, c. 1920s, Ellis Electrical Laboratories - Museum of Science and Industry (Chicago) - DSC06626 Stock Photo - Alamy
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Microfone de carbono, inventado em 1878 por David Edward Hughes, 1890
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Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From Theodore Eckardt "Physics in Pictures", London, 1882 Stock Photo - Alamy
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