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The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

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19th century numismatic device

Patent drawing of an 1853 coin tester showing a rectangular gage plate with five graduated slots labeled D through H mounted on two posts above a base, with hidden dotted lines revealing internal pivoting levers and a rod I running beneath the plate; a second elevation view shows a single lever swinging a coin through the gage into a collection area below.

COUNTERFEIT-COIN DETECTOR.Gideon B. Smith · September 6, 1853

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