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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Method for improving drill cuttings transport from a wellbore

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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Microtunnelling system and 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
Reexamination Certificate

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Multi-walled drill string for exploration-sampling drilling syst

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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