The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Patented April 25, 1933

If an object in your hands says PAT. APRIL 25, 1933, it may be one of these.

PatentTitleInventorOf
US 1,905,935FRAUD PREVENTIVE DEVICEHobart J. HalstedBuffalo, New York

All dates