Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4355691 | Hydraulic drilling apparatus | Esa Karru, Pekka Salmi, Aimo Helin | 1982-10-26 |
| 4343227 | Hydraulic percussion apparatus | Esa Karru, Pekka Salmi | 1982-08-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4355691 | Hydraulic drilling apparatus | Esa Karru, Pekka Salmi, Aimo Helin | 1982-10-26 |
| 4343227 | Hydraulic percussion apparatus | Esa Karru, Pekka Salmi | 1982-08-10 |