Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817204 | Optical communication apparatus and method for telephone supervisory and audio signals | Ralph J. Jannelli, Bruce Randall | 1989-03-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4817204 | Optical communication apparatus and method for telephone supervisory and audio signals | Ralph J. Jannelli, Bruce Randall | 1989-03-28 |