The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Coin-operated

Patent drawing of a Victorian coin-operated strength testing machine with a round dial gauge on top, a pillar with handles for pulling, and a sliding seat with foot rests mounted on a pedestal base.COIN-OPERATED MACHINE FOR TESTING MUSCULAR POWER.Percival Everitt · November 29, 1887Patent drawing of a tall wooden coin-operated height-measuring cabinet showing a sliding graduated bar, a coin chute mechanism, and a hinged pointer plate with associated levers and brackets.COIN-CONTROLLED HEIGHT-MEASURING MACHINE.Charles R. Williams · May 29, 1888Patent drawing of a cylindrical coin-operated strength-testing machine showing internal gearing, a rack bar, friction wheels, a coin chute, and a foot-piece lever connected by rods to the mechanism.COIN-CONTROLLED STRENGTH-TESTING MACHINE.Alfred W. Roovers and Alexander H. Roovers · August 19, 1890Patent drawing of a cabinet-style coin-operated lung testing machine showing a tall glowing lamp array, an internal air cylinder and piston with a coin chute and switch mechanism below, plus a detailed diagram of the wiring connections for the lamps.COIN-CONTROLLED TESTING-MACHINE.Santley M. Taylor · October 13, 1903