4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Fluid rotary type
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Hermetically sealed progressive cavity drive train for use in do

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

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High pressure downhole progressive cavity drilling apparatus wit

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

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Hydraulic braking device for turbine, turbine equipped with...

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

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