Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4425878 | Internal combustion engine cooling method and device | — | 1984-01-17 |
| 4393832 | Braking diesel engines | Heikki Hellemaa | 1983-07-19 |
| 4324212 | Compressed air starter | Heikki Hellemaa | 1982-04-13 |