File:Ruhmer photographophone (1901).jpg

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current09:53, 30 June 2023Thumbnail for version as of 09:53, 30 June 2023819 × 636 (97 KB)commons>Thomas H. WhiteUploaded 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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