Method and apparatus for collecting drill bit performance data

Method and apparatus for communicating with devices downhole in

Method and apparatus for controlling a rock drill on the basis o

Method and apparatus for data transmission in a well using a fle

Method and apparatus for detection of volatile soil contaminants

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

Method and apparatus for determining drill string movement mode

Method and apparatus for determining drilling paths to...

Method and apparatus for determining formation pararmeters...

Method and apparatus for determining path orientation of a passa

Method and apparatus for determining the orientation of a core c

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 sample collection times duri

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 inspecting subsurface environments

Method and apparatus for installing electronic equipment...

Method and apparatus for installment of underground utilities