Patented May 23, 1922
If an object in your hands says PAT. MAY 23, 1922, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 1,416,790 | SECRET COMBINATION LOCK | Joseph Ciotola and Dominick Polidoro | Philadelphia, Pennsylvania |
Three centuries of keeping things shut
If an object in your hands says PAT. MAY 23, 1922, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 1,416,790 | SECRET COMBINATION LOCK | Joseph Ciotola and Dominick Polidoro | Philadelphia, Pennsylvania |