The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Patented June 19, 1877

If an object in your hands says PAT. JUNE 19, 1877, it may be one of these.

PatentTitleInventorOf
US 192,241IMPROVEMENT IN COIN-DETECTERSPatrick DohertyPhiladelphia, Pennsylvania

All dates