4. Boring or penetrating the earth
  5. Automatic control
  6. In response to drilling fluid circulation
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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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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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