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Safety gate valve for petroleum wells, permitting operation by a

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety system

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve and ball type equalizing valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve for oil-wells and installation tool for the valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve hydraulically operated by telescopic drill stem mov

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve in particular for closing an oil well

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve utilizing an isolation valve and method of...

Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate

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Safety valve, sealing ring and seal assembly

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve, sealing ring and seal assembly

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valve, sealing ring and seal assembly

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Safety valves for wells

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Self closing equalizing valve for a subsurface well safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Shifting tool

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Shut-in tools

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Single-phase annulus-operated sliding sleeve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Sleeve valve device and shifting tool therefor

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Sleeve-type low pressure responsive APR tester valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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