4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Discharge passage for motive fluid directed toward bore...
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Device for removing debris from a drillhole

Boring or penetrating the earth – With below-ground tool drive prime mover – Discharge passage for motive fluid directed toward bore...
Patent

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Down-hole vane motor

Boring or penetrating the earth – With below-ground tool drive prime mover – Discharge passage for motive fluid directed toward bore...
Reexamination Certificate

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Drilling column with sledgehammer drilling head

Boring or penetrating the earth – With below-ground tool drive prime mover – Discharge passage for motive fluid directed toward bore...
Patent

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