Activated earth drill
Air-operated drilling machine or rotary-percussive action
Annular air-hammer apparatus for drilling holes
Annular drilling hammer
Apparatus and method for a hydraulic diaphragm downhole mud...
Apparatus and process for drilling underground arcuate paths uti
Apparatus for applying pressure to fluid seals
Apparatus for drilling a curved borehole
Apparatus for drilling a curved borehole
Apparatus for drilling oil and gas wells and a torque arrestor a
Apparatus for preventing separation of a down-hole motor from a
Apparatus for producing an upwardly directed drill hole
Apparatus for propulsion in elongated cavities
Apparatus for reducing hydro-static pressure at the drill bit
Apparatus for the removal of spoil when making trenches of great
Apparatus for transporting equipment through a conduit
Articulated coupling for use with a downhole drilling apparatus
Articulated tool for drilling oil, gas geothermal wells
Bearing assemblies, and bearing apparatuses and motor...
Bearing assemblies, and bearing apparatuses and motor...