136241 ⎘
Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor; Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms
Sub-classes:DIGITAL SPEED REGULATING VALVE FOR ALIGNING HYDRAULIC SUPPORTS IN FULLY MECHANIZED MINING FACE AND CONTROL METHOD THEREOF
#2Mining shield base lift wear pad
#3Mining shield base lift methods
#4Mining shield base lift apparatuses and methods
#5Coal caving cycle
#6Hydraulic circuit for longwall mining