Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799738 | Mining method for working large-scale mineral deposits by the caving system | Andras Solymos, Laszlo Kis-Tamas, Istvan Forisek, Laszlo Dorombozi, Otto Lukonits | 1989-01-24 |