4. Valves and valve actuation
  5. Fluid actuated or retarded
  6. Piston type expansible chamber reciprocating valve actuator

Douglas K. McLean

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Packing assembly for a movable shaft

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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Wellhead flow control devices

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

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