Boring or penetrating the earth
With below-ground tool drive prime mover
Plural below-ground drive prime movers
Inventor
active
Apparatus for positioning a split retaining ring in a down-hole
Device for removing debris from a drillhole
Device for removing drillhole debris
Entrainment fluid channeling device for a down-hole drill...
Exhaust valve and bit assembly for down-hole percussive drills
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Profile ID: LFUS-PAI-P-15089