Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879746 | Voice communication link interface apparatus | Robert F. Young | 1989-11-07 |
| 4876712 | Programmable telephone amplifier circuit interface | Gary T. Brint, Gabriele Bungardt, Jerel C. Gedecke, Robert L. Harris | 1989-10-24 |