Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854438 | Clutch disc for a friction disc clutch | Helmuth Weissenberger | 1989-08-08 |
| 4809835 | Releaser snap connection for a pulled-type diaphragm spring clutch | Erwin Ziegler, Werner Fricke, Helmuth Weissenberger | 1989-03-07 |