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Hawkins Polygraph, 1803
Photograph - Digital Image
HAWKINS' POLYGRAPH, 1803. John Isaac Hawkins' polygraph which he invented in 1803. Thomas Jefferson acquired the letter-copying device in 1804. Contemporary English line engraving.
June 30th, 2012
Viewed 34 Times - Last Visitor from Indianapolis, IN on 01/15/2015 at 6:38 PM
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