136080 ⎘
Props ; Chocks, e.g. made of flexible containers filled with backfilling material Non-telescopic props
Sub-classes:Internally injected replacement support room-type coal pillar recovery method
#2Underground support
#3Mine roof support
#4Apparatus and method for pre-loading mechanical constant-resistance single prop
#5Equipment system for no-roadway no-coal-pillar retained roadway mining method
#6Rib strap
#7Mine roof support
#8Engineered composite wooden crib for use as a mine support