File:Bell harmonic telegraph 0640.jpg
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:00, 2 April 2019 | | 2,000 × 871 (167 KB) | Administrator1 (talk | contribs) | |
| 16:38, 18 November 2008 |  | 640 × 279 (15 KB) | Leydoig (talk | contribs) | Copyright held by Smithsonian |
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