4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Fluid rotary type
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Seal for well drilling assembly

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

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Sealed bearing assembly used in earth drilling

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

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Sealing system for a sealed bearing assembly

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

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Self-blocking safety device

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

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Solids diverter for a downhole drilling motor

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

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Stabilized down hole drilling motor

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

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System for use in a bore hole for axially coupling a tubular...

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

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Systems and methods for protecting drill blades in high...

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

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