4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Fluid passage to exterior of drive point

Kwong-Onn C. Chan

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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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Drill string shutoff valve

Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Reexamination Certificate

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Drill string shutoff valve

Boring or penetrating the earth – Processes
Reexamination Certificate

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Remedial system to flush contaminants from tubing string

Wells – Processes – Cleaning or unloading well
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2832892

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