Articulated tool for drilling oil, gas geothermal wells
Borehole drilling motor with flexible shaft coupling
Combination thrust and radial bearing for use in down-hole drill
Downhole drilling tool
Downhole drilling tool
Drill string orienting motor
In-hole motor drill with bit clutch
In-hole motor drill with locking bit clutch
In-hole motor drill with locking bit clutch
Locking clutch for downhole motor
Method and apparatus for drilling boreholes in earth formations
Method and apparatus for drilling boreholes in earth...
Method and apparatus for drilling in permafrost and the like
Sectional drive and coupling system
Stabilization devices for drill motors
Swivel/tilting bit crown for earth-boring drills
Swivel/tilting bit crown for earth-boring drills
Tubular actuator component for use in a drill string