4. Boring or penetrating the earth
  5. Automatic control
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Head brake release with memory and method of controlling a drill

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

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High density slurry

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Horizontal earth boring machine and method

Boring or penetrating the earth – Automatic control
Patent

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Hydraulic drilling apparatus and method

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

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Hydrojet drilling means

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

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