4. Wells
  5. Valves, closures or changeable restrictors
  6. Longitudinally movable operator

Robert C. Henschel

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Curved flapper with angle variant seat for a subsurface...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Method and apparatus for retaining a soft seal in an...

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2853946

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