Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4538033 | Data bridge with gating and/or testing | Duncan Bruce | 1985-08-27 |
| 4403119 | DTMF Activated remote telephone line switching and testing | Duncan Bruce | 1983-09-06 |
| 4258236 | Remote telephone line switching and testing | Duncan Bruce | 1981-03-24 |