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Universal cementing plug

Wells – Packers or plugs – Flow stopping type; e.g. – plug
Reexamination Certificate

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Universal cementing plug

Wells – Packers or plugs – Flow stopping type; e.g. – plug
Reissue Patent

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Unrestricted bore safety joint

Wells – Packers or plugs – Controllable passage through packer
Patent

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Using pipe shrinkage upon expansion to actuate a downhole tool

Wells – Packers or plugs – With expanding anchor
Reexamination Certificate

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Utilization of energy from flowing fluids

Wells – Packers or plugs – Controllable passage through packer
Reexamination Certificate

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