An assembly and method for discharging fluid into a drill...

An assembly and method for forming a seal in junction of a...

An automatic control system and method for bottom hole...

An axle, a friction reducing fitting and an axle...

An elongate element tensioning member

An elongate element tensioning member

An elongate element tensioning member

An energy transfer assembly

An entry well with slanted well bores and method

An erectable arm assembly for use in boreholes

An expandable hanger and packer

An expandable metal liner for downhole components

An improved apparatus for ground support

An improved coring bit and method for obtaining a material...

An improved coring bit motor and method for obtaining a...

An improved friction washer

An improved rotary roller reamer

An improved rotary roller reamer

An improved transmission sleeve

An improved up-hole hammer drill bit