US PATENT SUBCLASS 251 / 63
.~.~ Unitary piston and valve


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12  DF  FLUID ACTUATED OR RETARDED {12}
62  DF  .~ Piston type expansible chamber reciprocating valve actuator {3}
63.~.~ Unitary piston and valve


DEFINITION

Classification: 251/63

(under subclass 62) Subject matter wherein the piston and the valve forms a unitary structure.