4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
  6. With tool shaft having plural passages for drilling fluid
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Check valve sub

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Continuous injection of an inert gas through a drill rig for dri

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Coupling structure for a compound drill stem

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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