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Portable earth boring machine

Boring or penetrating the earth – Automatic control
Patent

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Portable earth boring machine

Boring or penetrating the earth – Automatic control
Patent

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Positioning device for a member and drilling system employing sa

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

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Procedure for controlling a rock drill and rock drill for carryi

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent

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Process and device for guiding a drilling tool through geologica

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

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Process and drilling equipment for sinking a well in underground

Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Patent

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Programmed automatic drill control

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent

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Programming method for controlling a downhole steering tool

Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Reexamination Certificate

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