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Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From R. Wormell 'Electricity in the Service of Man'London, 1890. Engraving.

Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From R. Wormell 'Electricity in the Service of Man'London, 1890. Engraving.
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Caption:
Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From R. Wormell 'Electricity in the Service of Man'London, 1890. Engraving
Credit:
Album / World History Archive
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Model: No - Property: No
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Image size:
6000 x 5532 px | 95.0 MB
Print size:
50.8 x 46.8 cm | 20.0 x 18.4 in (300 dpi)
Keywords: