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  5. Valves, closures or changeable restrictors
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Hydraulic control fluid communication nipple

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

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Hydraulically actuated control fluid communication nipple

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

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Hydraulically controlled safety valves for incorporation in prod

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

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