Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4796398 | Foundation of a building or installation erected across a ravine extending along a slope | Semen P. Valts, Alexandr M. Lekhno, Alexandr N. Tetior, Boris J. Barykin | 1989-01-10 |