Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884642 | Percussive action machine | Petr Y. Fadeev, Vladlen V. Korobkov, Rim A. Kulagin, Nikolai P. Ermilov | 1989-12-05 |
| 4819542 | Percussive tool | Petr Y. Fadeev, Vladeen V. Korobkov, Rim A. Kulagin, Nikolai P. Ermilov | 1989-04-11 |
| 4796956 | Machine for driving workings in hard rocks | Petr Y. Fadeev, Vladlen V. Korobko, Rim A. Kulagin, Nikolai P. Ermilov | 1989-01-10 |