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

Lester L. Cain

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Fluid flow and pressure control system and method

Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Reexamination Certificate

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Method and apparatus for controlling back pressure

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

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