File:Illustration of revolving stairs (U.S. Patent 25,076 issued to Nathan Ames, 9 August 1859).jpg
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Date/Time | Dimensions | User | Comment | |
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current | 07:27, 15 June 2012 | 1,680 × 2,368 (645 KB) | Danmichaelo | Higher resolution scan from Google Patents |
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