4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Below-ground storage of motivating energy
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High pressure converter for deep well drilling

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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Hydraulic drive apparatus for downhole tools providing rotationa

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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Hydraulic in-the-hole percussion rock drill

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Reexamination Certificate

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Hydraulic in-the-hole percussion rock drill

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Reexamination Certificate

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Hydraulically operated downhole motor

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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