Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848402 | Rotary slide valve for hydraulic auxiliary power steerings | Helmut Hetzel, Manfred Keller | 1989-07-18 |
| 4819757 | Power steering for motor vehicles | Friedemann Weiler | 1989-04-11 |