Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4979575 | Method of drilling a hole-in a rock | Veijo Nurmi, Risto Wisakanto | 1990-12-25 |
| 4702621 | Bearing arrangement for a feeding device for a drilling machine | Jarmo Heinonen, Risto Wisakanto | 1987-10-27 |