Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809272 | Telephone switching system with voice detection and answer supervision | Willard J. Torgrim | 1989-02-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809272 | Telephone switching system with voice detection and answer supervision | Willard J. Torgrim | 1989-02-28 |