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

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Valve retrieval mechanism for an inflatable packer system

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Variable downhole choke

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

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Variable flow sliding sleeve valve and positioning shifting tool

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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