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  5. Valves, closures or changeable restrictors
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Delayed opening ball seat

Wells – Valves – closures or changeable restrictors – Destructible element
Reexamination Certificate

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Differential fill valve assembly

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Differential valve

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Drop ball sub-assembly for a down-hole device

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Dump valve assembly for selective draining of liquid from an...

Wells – Valves – closures or changeable restrictors – Destructible element
Reexamination Certificate

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