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  5. Valves, closures or changeable restrictors
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Process and device for the centering of casings as used for unde

Wells – Valves – closures or changeable restrictors
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Process for use in degasification of subterranean mineral deposi

Wells – Valves – closures or changeable restrictors
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Production fluid control device and method for oil and/or gas we

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

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Production fluid control device and method for oil and/or...

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

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Production tubes for use in the completion of an oil well

Wells – Valves – closures or changeable restrictors – Operated by dropped element
Patent

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Production tubing shunt valve

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

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Pump down method

Wells – Valves – closures or changeable restrictors
Patent

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