Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4850011 | Key telephone system providing selection of key or PBX operational modes | James W. Delmege | 1989-07-18 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4850011 | Key telephone system providing selection of key or PBX operational modes | James W. Delmege | 1989-07-18 |