Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844630 | Method and circuit arrangement for protection of typewriters or similar machines against consequences of electrostatic discharge | Klaus Hagen | 1989-07-04 |
| 4797018 | Ribbon cassette and method for operating an electronically controlled typewriter | Norbert Hofmann | 1989-01-10 |