Image: Hedgehog3
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Description: The first known model of the puzzle "Hedgehog in the Cage", patented by the American inventor Clarence A. Worrall on 7 April, 1896 in Philadelphia, Pennsylvania.
Title: Hedgehog3
Credit: http://www.google.com/patents?id=MQ5VAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false
Author: Clarence A. Worrall
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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