Padlock Patent — Keyed
Inventor: Frederick F. Richards, Sr.
View on USPTO / Google Patents ↗| Patent Number | 4138868 |
|---|---|
| Issue Date | 1977-08-19 |
| Inventor | Frederick F. Richards, Sr. |
| Assigned To | Vingcard Systems Inc |
| Patent Type | Keyed |
| External Link | https://patents.google.com/patent/US4138868/en ↗ |
