4. Valves and valve actuation
  5. Fluid actuated or retarded
  6. Piston type expansible chamber reciprocating valve actuator
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Oil well safety valve for use with drill pipe

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

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Operating device for a cylindrical gate

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

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Outlet valve

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

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Outlet valve

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

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