4. Boring or penetrating the earth
  5. Automatic control
  6. Of boring means including a below-ground drive prime mover

Rudolf Roper

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Auxiliary controlled valve disposed in a drilling string

Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
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Directional drilling tool apparatus and method

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent

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Profile ID: LFUS-PAI-P-348985

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