4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Fluid rotary type
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Improved mud motor system incorporating fluid bearings

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

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In-hole motor drill with locking bit clutch

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

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Inverted motor for drilling rocks, soils and man-made...

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

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