Image: Illustration of revolving stairs (U.S. Patent 25,076 issued to Nathan Ames, 9 August 1859)
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Description: Illustration from U.S. Patent #25,076: Revolving Stairs. Issued to Nathan Ames, 9 August 1859.
Title: Illustration of revolving stairs (U.S. Patent 25,076 issued to Nathan Ames, 9 August 1859)
Credit: US Pat 25,076.
Author: Nathan Ames. Available from the United States Patent Office Web site. Also reproduced by Google Patents.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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