Patented August 19, 1890
If an object in your hands says PAT. AUGUST 19, 1890, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 434,608 | COIN-CONTROLLED STRENGTH-TESTING MACHINE. | Alfred W. Roovers and Alexander H. Roovers | Brooklyn, New York |
The Counterfeit Coin Detector Patent Archive
Every device ever patented to catch a bad coin
If an object in your hands says PAT. AUGUST 19, 1890, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 434,608 | COIN-CONTROLLED STRENGTH-TESTING MACHINE. | Alfred W. Roovers and Alexander H. Roovers | Brooklyn, New York |