4. Boring or penetrating the earth
  5. Automatic control
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Methods and apparatus for controlled directional drilling of bor

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

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Methods and systems for averting or mitigating undesirable...

Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Reexamination Certificate

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Modular design for downhole ECD-management devices and...

Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Reexamination Certificate

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Modulated bias unit for rotary drilling

Boring or penetrating the earth – Automatic control
Patent

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