Issued Patents 2011
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8061434 | Percussion device | Markku Keskiniva, Mauri Esko, Erkki Ahola | 2011-11-22 |
| 7891437 | Method for breaking rock | Markku Keskiniva, Erkki Ahola, Mauri Esko, Aimo Helin | 2011-02-22 |
| 7878263 | Pressure-fluid-operated percussion device | Markku Keskiniva, Mauri Esko, Erkki Ahola, Aimo Helin | 2011-02-01 |