Horizontal directional drilling machine employing inertial...

Integrated transmitter surveying while boring entrenching...

Laser positioning system for earth boring apparatus

Linear position sensor for downhole tools and method of use

Linear position sensor for downhole tools and method of use

Locating device for percussion boring machines

Locating devices for soil displacement hammers

Locating the relative trajectory of a relief well drilled to kil

Long reach rotary drilling assembly

Mapping tool for tracking and/or guiding an underground...

Mapping tool for tracking and/or guiding an underground...

Measurement-while-drilling devices with pad mounted sensors

Method and apparatus for collecting drill bit performance data

Method and apparatus for determining a trajectory of a...

Method and apparatus for determining drilling paths to...

Method and apparatus for determining path orientation of a passa

Method and apparatus for drilling and completing wells

Method and apparatus for drilling bore holes under pressure

Method and apparatus for drilling bore holes under pressure

Method and apparatus for indicating the orientation of a down ho