4. Wells
  5. Above ground apparatus
  6. Inner member anchor or seal with valve

John M. Zwiegel

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Casing hanger and seal

Wells – Above ground apparatus – Inner member anchor or seal with valve
Patent

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Fail-safe valve actuator

Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent

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Profile ID: LFUS-PAI-P-253371

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