Interlocking boltless lining and support structure for...
Interlocking boltless lining and support structure for...
Jack for installing a mine stopping
Jacket tube for a drilling and anchoring device
Jacking devices
Joining of tube-formed expansion bolt
Knife shield driving device and method for the excavating...
Lateral transfer systems for raise climber
Lemniscate mining supports
Lining element for a drilled tunnel
Lining of tubular structures
Lining support for underground mining and tunneling
Lining system for tunnels and like passages
Load support
Loading machine incorporating an impactor
Longwall jacks
Longwall mining roof control system
Low torque threaded fastener and mine roof support system...
Machine for driving mine roof pins
Machine for excavating underground galleries