Machine for mining tar sands having rearwardly directed exhaust
Machine for mining thin seamed hard material in-situ between adj
Method and apparatus for boring and shearing of rocks
Method for replacing cutters of tunnel-excavating machine,...
Milling engine for excavating trenches in the ground
Mining machine
Mining machine having an extendable and retractable rotor...
Mining machine having vertically movable primary and secondary c
Mining machinery with guideway for relatively movable cutting un
Mining machines
Mobile dual auger continuous mining machine with multiple moveme
Modified strip mining apparatus
Movable cutting machine
Multipurpose mining machine