4. Boring or penetrating the earth
  5. Automatic control
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Liquid lift method for drilling risers

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

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Load compensator for a pipe running tool

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

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Long range electronic guidance system for locating a...

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

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