4. Boring or penetrating the earth
  5. Automatic control
  6. Of fluid pressure below ground
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Device for remote actuating equipment comprising delay means

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

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Devices and methods for power control in horizontal...

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

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Downhole tool including pressure intensifier for drilling...

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

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Drill pipes and casings utilizing multi-conduit tubulars

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

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Drill string shutoff valve

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

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Drilling system

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

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