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Image
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1
Non-Commercial Use
1
Category
Telecommunications
1
Maker
Edison, Thomas Alva
1
Thomas Alva Edison
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On Display
Science Museum
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Information Age Gallery: Exchange
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Object type
telephone component
1
Place
United States
1
Material
copper (metal)
1
metal (unknown), carbon
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Date
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Edison carbon button transmitter No. 32, 1878
1878
