Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5318140 | Fluid operated drill apparatus | Berndt Ekwall, Martin Allen Peterson | 1994-06-07 |
| 5279371 | Down-the-hole drilling machine | Berndt Ekwall, Martin Allen Peterson | 1994-01-18 |