4. Boring or penetrating the earth
  5. Automatic control
  6. Of fluid pressure below ground
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Closed-loop control of hydraulic pressure in a downhole...

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

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Closed-loop physical caliper measurements and directional...

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

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