4. Boring or penetrating the earth
  5. Automatic control
  6. Of boring means including a below-ground drive prime mover
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Device for adjusting the path of a rotary drilling tool

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

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Device for drilling a hole in the side wall of a bore hole

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

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Directional drilling control

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

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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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Distributed sensors-controller for active vibration damping...

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

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Downhole weight control device for impact rock drilling tool

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

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Drilling method and apparatus

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

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Drilling system

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

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Drilling tool for sinking wells in underground rock formations

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

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Dual antenna radio frequency locating 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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