Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4722403 | Annular air-hammer apparatus for drilling holes | Alexandr D. Kostylev, Boris B. Danilov, Boris N. Smolyanitsky, Vladimir P. Boginsky, Jury N. Syryamin +2 more | 1988-02-02 |
| 4705119 | Annular air-hammer apparatus for drilling holes | Alexandr D. Kostylev, Boris B. Danilov, Boris N. Smolyanitsky, Vladimir P. Boginsky, David Kogan +1 more | 1987-11-10 |