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-
Bit retention device for a bit and chuck assembly of a down-the-
Bit retention system
Bit retention system
Bottom rotation shaft actuator
Bumping and jarring tool
Cable overshot apparatus
Clutch for a jack element
Coil tubing hydraulic jar device
Coil tubing hydraulic jar device
Compensation device for insertion in a drill string for deep-wel
Compression shock absorber device
Control device
Converted dual-acting hydraulic drilling jar
Converted dual-acting hydraulic drilling jar
Coupling piece for use at simultaneous earth and/or rock drillin
Derrick mounted apparatus for the manipulation of pipe