4. Boring or penetrating the earth
  5. Automatic control

Falk W. Doering

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Chain drive system

Boring or penetrating the earth – With below-ground tool drive prime mover – With mechanical motion-converting means
Reexamination Certificate

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Open hole tractor with tracks

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
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-2982433

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