T-post hole-forming device and use for installing a T-post
Taper lock removable stem for raise bit
Tapered friction bearing assembly
Targetable drill with pressure telemetering of drill parameters
Technique for damping oscillations in a drill string
Technique for damping oscillations in a drill string
Technique for disarming and arming electrically fireable explosi
Technique for drilling straight bore holes in the earth
Technique for providing an underground tunnel utilizing a powere
Technique for providing an underground tunnel utilizing a powere
Technique for providing an underground tunnel utilizing a powere
Technique for steering a downhole hammer
Technique for steering and monitoring the orientation of a power
Telemetry method for cable-drilled boreholes and method for carr
Telescopable boring rod mechanism
Telescopic bar of drill rig
Telescopic drilling method
Telescopic kelly bar apparatus and method
Telescopically extensible drill
Telescoping casing joint for landing a casting string in a well