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

Method and apparatus for indicating the position of one well bor

Method and apparatus for installment of underground utilities

Method and apparatus for installment of underground utilities

Method and apparatus for producing parallel boreholes

Method and apparatus for rescaling measurements while...

Method and apparatus for self orienting a drill string while dri

Method and device for rotary well drilling

Method and means for drilling in rocks

Method and rock drilling apparatus for controlling rock...