Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4458764 | Device in rock or earth drilling apparatus for rotary drilling | — | 1984-07-10 |
| 4456077 | Device for reciprocating motion of a rotating drilling body of a drilling machine | Arne Lagerstedt | 1984-06-26 |