File:Ruhmer photographophone (1901).jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:53, 30 June 2023 | 819 × 636 (97 KB) | Thomas H. White | Uploaded a work by Scientific American, New York from Figure 3 from "The 'Photographophone'", Scientific American, July 20, 1901, page 36. with UploadWizard |
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