Apparatus for coal mining in-cutting and out-cutting
Apparatus for continuous mining
Apparatus for drilling and inserting a horizontal pipe
Apparatus for extending and retracting the cutter bars of a bori
Auger flight support for plural auger coal mining systems
Auger flight support system
Auger mining machine
Auger mining machine
Auger type mining machine
Boring machine having hydrostatic bearings
Combined milling and impact apparatus for tunneling
Continuous boring or cutting machine
Continuous miner with cutter assembly attitude adjustment
Continuous mining machine having contour cutters
Continuous mining machine with hinged cutter guide extensions
Continuous mining machine with improved cutter head slide means
Cutter head and method for mining hard rock
Cutter head, tunnel excavating machine, and cutter replacing...
Device for enlarging a chimney
Device for removing the earth generated by tunneling