Category:1878 in technology
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This category has the following 5 subcategories, out of 5 total.
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Media in category "1878 in technology"
The following 4 files are in this category, out of 4 total.
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Fig 6 Le Telephone by T du Moncel Paris 1878.png 4,576 × 3,648; 996 KB
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Microphone.png 711 × 225; 65 KB
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Polyscope 1.png 353 × 475; 33 KB