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DeutschFile:Electric lamp patent.jpg
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Thomas Edison's Patent drawing for an improvement in electric lamps, patented January 27, 1880
Record Group 241, Records of the Patent and Trademark Office Image
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:16, 15 September 2005 | | 550 × 802 (73 KB) | Darwinek (talk | contribs) |
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