The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Patented June 27, 1905

If an object in your hands says PAT. JUNE 27, 1905, it may be one of these.

PatentTitleInventorOf
US 793,584FRAUD-PREVENTIVE FOR COIN-CONTROLLED MACHINESMaurice HofheimerNew York, New York

All dates