Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4367376 | Electronic telephone ringer including anti-bell tap provisions | Darrell D. Cole | 1983-01-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4367376 | Electronic telephone ringer including anti-bell tap provisions | Darrell D. Cole | 1983-01-04 |