4. Wells
  5. Valves, closures or changeable restrictors
  6. Fluid operated

Alan G. Schroeder

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Flow tube for use in an equalizing subsurface safety valve

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

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Well lock having retractable no-go dogs

Wells – Expansible anchor or casing – Expansible means translated by wedge or cam
Patent

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Profile ID: LFUS-PAI-P-1706197

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