This lock was manufactured by Johnson Lock Co. | Classification: 70/40
| Patent Number | 1788396 |
|---|---|
| Issue Date | January 13, 1931 |
| Inventor | Johnson, Colvin L. |
| Assigned To | Webb, Frank C. |
| Patent Type | Chain |
| External Link | https://patents.google.com/patent/US1788396 ↗ |
