4. Wells
  5. Valves, closures or changeable restrictors
  6. Rotated operator

John H. Easter

Inventor

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Rotatable reciprocating collar for borehole casing

Wells – Conduit wall or specific conduit end structure – Downhole coupling or connector
Patent

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Stage cementing apparatus

Wells – Valves – closures or changeable restrictors – Rotated operator
Patent

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Profile ID: LFUS-PAI-P-1103732

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