4. Wells
  5. Pistons, fluid driven into well
  6. With downflow past piston
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Anti-rotation method and apparatus for limiting rotation of...

Wells – Pistons – fluid driven into well – With downflow past piston
Reexamination Certificate

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Anti-rotation method and apparatus for limiting rotation of...

Wells – Pistons – fluid driven into well – With downflow past piston
Reexamination Certificate

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Apparatus for detecting ruptures in drill pipe above and below t

Wells – Pistons – fluid driven into well – With downflow past piston
Patent

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