Accelerator for fishing jar with hydrostatic assist
Annular air hammer apparatus for drilling wells
Annular air-hammer apparatus for drilling holes
Apparatus for positioning a split retaining ring in a down-hole
Backhead and check valve for down-hole drills
Backhead and check valve for down-hole drills
Backhead and drill assembly with backhead
Bedrock drilling and excavating apparatus
Bidirectional fluid operated vibratory jar
Bit retention device for a bit and chuck assembly of a down-the-
Bumping and jarring tool
Coil tubing hydraulic jar device
Coil tubing hydraulic jar device
Converted dual-acting hydraulic drilling jar
Converted dual-acting hydraulic drilling jar
Coupling piece for use at simultaneous earth and/or rock drillin
Device for channeling solids and fluids within a reverse...
Device for drilling a bore hole in the ground
Directional drilling system
Directional drilling tool