Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4304428 | Tapered screw joint and device for emergency recovery of boring tool from borehole with the use of said joint | Samvel S. Grigorian, Jury M. Markov, Alexandr A. Shakhnazahov, Eduard A. Akopov, Marina V. Kameneva | 1981-12-08 |