Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4819741 | Reversiele percussion device | Vladimir D. Plavskikh, Alexandr D. Kostylev, Nikolai Grigorievich Nazarov, Nikolai P. Chepurnoi, Evgeny N. Cherednikov +1 more | 1989-04-11 |