Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4988860 | Electronic trigger for prepay type telephone paystations | Gary Grantland | 1991-01-29 |
| 4660706 | Coin receiving mechanism having a slideable door to prevent coin insertion after stuffing | — | 1987-04-28 |