Boring or penetrating the earth
With below-ground tool drive prime mover
With positive connection between tool and support shaft for...
Inventor
active
Activating ball assembly for use with a by-pass tool in a...
Activating mechanism for controlling the operation of a...
Ball operated by-pass tool for use in drillstring
Dart-operated big bore by-pass valve
Downhole jetting tool
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Profile ID: LFUS-PAI-P-1388067