4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Fluid rotary type
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Peristaltic down-hole drilling motor

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

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Pressure balanced bearing assembly for downhole motors

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

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Process and universal downhole motor for driving a tool

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

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Progressing cavity motor governing system

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

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Progressive cavity drive train with elastomeric joint assembly f

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

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