File:Opticaltelegraph.png
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 05:45, 20 June 2021 | | 800 × 600 (94 KB) | Andrew (talk | contribs) | Uploaded a work by unknown from https://solar.lowtechmagazine.com/2007/12/email-in-the-18.html with UploadWizard |
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