4. Boring or penetrating the earth
  5. Processes
  6. Boring curved or redirected bores

Ralph Ehlers

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Method and apparatus for navigational drilling with a downhole m

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Torque compensation apparatus for bottomhole assembly

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
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Profile ID: LFUS-PAI-P-851861

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