Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834029 | Internal combustion engine | Jurgen Wahnschaffe, Ernst-Siegfried Hartmann | 1989-05-30 |
| 4834030 | Diesel internal combustion engine | Lothar Bauer, Wolfgang Strusch, Ernst-Siegfried Hartmann, Juergen Wahnschaffe | 1989-05-30 |