Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6029753 | Increased efficiency percussion piston and method for operating same | Hannu Paasonen | 2000-02-29 |
| 4711090 | Method of and device for adjusting the feed movement of a drill rod for drilling a rock | Eero Hartiala, Hannu Paasonen | 1987-12-08 |
| 4648467 | Pressure fluid operated percussion drilling machine provided with a rotation mechanism | Unto Ahtola | 1987-03-10 |