Patented December 29, 1931
If an object in your hands says PAT. DECEMBER 29, 1931, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 1,838,907 | CHECK CONTROLLED MECHANISM | Arthur H. Du Grenier | Haverhill, Massachusetts |
The Counterfeit Coin Detector Patent Archive
Every device ever patented to catch a bad coin
If an object in your hands says PAT. DECEMBER 29, 1931, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 1,838,907 | CHECK CONTROLLED MECHANISM | Arthur H. Du Grenier | Haverhill, Massachusetts |