Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861177 | Reloadable ribbon cassette system | Hans-Peter Heins, Hermann Jendricke | 1989-08-29 |
| 4820125 | Ribbon device for typewriters or similar office machines | Manfred Sauer | 1989-04-11 |