Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854755 | Reloadable ribbon cassette system | Hans-Peter Heins, Hermann Jendricke | 1989-08-08 |
| 4813072 | Switching device for power supply to additional accessories for a telephone | Klaus M. Moses | 1989-03-14 |