4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. With mechanical motion-converting means
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Reduction unit of drilling motor

Boring or penetrating the earth – With below-ground tool drive prime mover – With mechanical motion-converting means
Patent

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Rotary and mud-powered percussive drill bit assembly and method

Boring or penetrating the earth – With below-ground tool drive prime mover – With mechanical motion-converting means
Reexamination Certificate

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