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Metal-to-metal non-elastomeric seal stack

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

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Metal-to-metal sliding side door for wells

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

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Method and apparatus for cementing a well

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

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Method and apparatus for stimulating hydrocarbon wells

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

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Multi-cycle downhole apparatus

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

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Multi-cycle downhole apparatus

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

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Multi-function indicating tool

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

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Multi-position valve for fracturing and sand control and...

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

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