Apparatus for measuring weight and torque on drill bit...
Apparatus to measure the earth's local gravity and...
Auger drill directional control system
Azimuth measuring method for non-vertical drilling
Bore location system having mapping capability
Bore location system having mapping capability
Bore location system having mapping capability
Borehole drilling control system, method and apparatus
Borehole survey method and apparatus for drilling substantially
Boring tool control using remote locator
Boring tool control using remote locator
Boring tool control using remote locator
Boring tool control using remote locator
Boring tool control using remote locator including a command...
Boring tool having electromagnetic wave generation capability
Bottomhole assembly orienting sub
Calculating directional drilling tool face offsets
Centralizer-based survey and navigation device and method
Change in length of drill string containing an instrument
Coal auger guidance system