Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848402 | Rotary slide valve for hydraulic auxiliary power steerings | Dieter Elser, Helmut Hetzel | 1989-07-18 |
| 4795612 | Apparatus for the detection of filterable gas contaminants | — | 1989-01-03 |