| 5116104 |
Method and equipment for loosening and/or winning minerals especially coal and aggregated materials by using compressed air breaking |
Gyorgy Gergo, Zoltan Vida, Jozsef Nemeth, Istvan Viragh |
1992-05-26 |
| 4626031 |
Apparatus for loosening and/or breaking coal deposits, rocks, granular or lumpy material, or scrap |
Jozsef Nemeth, Laszlo Belley, Gyorgy Gergo, Zoltan Vida |
1986-12-02 |
| 4558748 |
Method and equipment for boring and casing air vent holes and/or delivery holes in medium-steep and steep dip coal deposits and rocks of loose structure |
Gyorgy Gergo, Jozsef Nemeth, Zoltan Vida |
1985-12-17 |
| 4498391 |
Explosive mine breaking apparatus with arc-suppressing heat-dissipating fluid around the charge bodies |
Gyorgy Gergo, Jozsef Nemeth, Bela Solymossy |
1985-02-12 |