Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4836162 | Engine brake of an internal combustion engine | Helmut Melde-Tuczai, Johann Aigner | 1989-06-06 |
| 4836171 | Injection-type internal combustion engine | Helmut Melde-Tuczai, Josef Rachholz | 1989-06-06 |