4. Wells
  5. Valves, closures or changeable restrictors
  6. Longitudinally movable operator
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Access valve for drill stem testing

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

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Annulus safety valve

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

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Apparatus for locking a ball valve element in one position

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

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Axial equalizing valve

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

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