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

David McCalvin

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Flapper gas lift valve

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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System and method for controlling flow in a wellbore

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

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Profile ID: LFUS-PAI-P-2352611

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