Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4415776 | Telephone music-on-hold device | Donald C. L. Tang | 1983-11-15 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4415776 | Telephone music-on-hold device | Donald C. L. Tang | 1983-11-15 |