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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Drill pipes and casings utilizing multi-conduit tubulars

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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Drill rod

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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Drill string component for drilling with a liquid driven drillin

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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Drilling apparatus

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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