4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. Rotary drive for a relatively advancing tool
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Hydraulic clamp for rotary drilling head

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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Hydrocarbon recovery drill string apparatus, subterranean...

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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