Method of and hydraulic roof support system for rearranging a packing dam
CS582087A2
Device for manufacturing steelrubber schacht rope
PL252700A1
Double-acting hydraulic prop
PL250534A1
Double-action hydraulic prop
PL248610A1
Method of mining deposits of minerals while continually keeping under control any surface deformations in particular within a region affected by mining
PL248609A1
Method of preparing coal deposits under crump hazard for mining them
PL248135A1
Geophonic probe
PL246466A1
Roof-bar lifting method and apparatus
PL246086A1
Single set of longwall housing
PL244907A1
Method of monitoring load condition of dog heading roof supports and sensing pad therefor
PL244908A1
Method of protecting a roof in area where two or more workings are crossing each with other
PL244909A1
Set used to reinforce a dog heading arching
PL244566A1
Mechanized roof support advancement system
PL244569A1
Longwall section of a roof support system
PL244567A1
Longwall type roof support
PL244568A1
Mechanized roof support
PL240343A1
Method of mining the rest of coal deposits using the longitudinal system with roof rock caving,in particular of deposits being endangered by crumps,fires and gases
PL240287A1
Braking trolley of a mine-type overhead bucket conveyor
