File:Illustration of revolving stairs (U.S. Patent 25,076 issued to Nathan Ames, 9 August 1859).jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:27, 15 June 2012 | 1,680 × 2,368 (645 KB) | Danmichaelo | Higher resolution scan from Google Patents | |
02:12, 1 February 2009 | 351 × 576 (85 KB) | BFDhD | {{Information |Description={{en|1=Illustration from U.S. Patent #25,076: Revolving Stairs. Issued to Nathan Ames, 9 August, 1859.}} |Source=[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1 |
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