Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884933 | Adaptor for screwheads and the like | Rosel Preusker | 1989-12-05 |
| 4854359 | Antiskid device, particularly for pneumatically tired vehicle wheels on snow and ice surfaces | Heiko Ippen | 1989-08-08 |