Theatrophone_-_Clement_Ader_1881.JPG (283 × 502 pixels, file size: 22 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:57, 21 November 2007 | 283 × 502 (22 KB) | Utcursch | {{Information |Description=''Théâtrophone''. Plan device théatrophone at the Opera during the World Exhibition in Paris (1881). |Source=Th du Moncel, ''Le téléphone'', Librarie Hachette. |Date=1887 |Author=Clément Ader (1841-192 |
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