4. Wells
  5. Automatic

Daniel Purkis

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Apparatus for controlling a downhole device

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

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Digital-hydraulic well control system

Wells – Automatic
Reexamination Certificate

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Downhole tractor

Wells – Guide for device or conduit
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2061898

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