Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880086 | Adjustable vibration damper | Norbert Ackermann | 1989-11-14 |
| 4850460 | Hydraulic adjustable shock absorber | Alfred Preukschat | 1989-07-25 |
| 4802561 | Adjustable shock absorber | Norbert Ackermann | 1989-02-07 |