Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4352959 | Device for visual display of telephone operation symbols | Gerhard Schiller | 1982-10-05 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4352959 | Device for visual display of telephone operation symbols | Gerhard Schiller | 1982-10-05 |