Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5129470 | Drill hole filling method and apparatus | — | 1992-07-14 |
| 4974689 | Drill hole filling method and apparatus | — | 1990-12-04 |
| 4643619 | Apparatus for feeding cement material into a drill hole for cement bolting of a rock | — | 1987-02-17 |
| 4632618 | Feed storage for drill rods for a long-hole drilling apparatus | — | 1986-12-30 |
| 4576525 | Method and equipment for performing rock bolting | Pertti Heikkila | 1986-03-18 |
| 4514111 | Method of and apparatus for installing solder bolts in rock bolting | — | 1985-04-30 |