Hydraulically driven kelly crowd
Hydraulically powered drill press
Kelly crowd for vertical drill rig
Mechanical differential-rate counterboring tool
Mechanical quill having selective braking capability
Mechanism for tensioning fluid hoses on a rock drill feed
Methods of and apparatus for winning reef
Mobile drilling apparatus
Mounting apparatus for a rotational drive unit
Multi function drill drive system
Multi-stage double-acting extendible and contractible shaft driv
Pile or sheet-pile driver
Pipe gripping apparatus with interlocking plates
Portable drilling system
Portable earth boring machine
Portable earth boring machine
Portable earth drilling apparatus
Power slip assembly
Pressure fluid powered machine tool
Pressurized medium actuated gripping device