4. Boring or penetrating the earth
  5. Automatic control

Robin A. Ewan

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Self-anchoring device with force amplification

Wells – Grapple and well anchored lifting means
Reexamination Certificate

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Traction control for downhole tractor

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Traction control for downhole tractor

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2982434

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