4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Fluid rotary type
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Retrievable bit and eccentric reamer assembly

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Reverse-circulation drilling method and system

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate

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Rotary earth boring tool

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Rotary seal for directional drilling tools

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate

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Rotating shaft seal and bearing lubricating apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Rotor of a screw hydraulic downhole motor, method for its produc

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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