The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Patented July 12, 1892

If an object in your hands says PAT. JULY 12, 1892, it may be one of these.

PatentTitleInventorOf
US 478,709COIN-CONTROLLED DEVICE FOR PHONOGRAPHS.John F. OttOrange, New Jersey

All dates