US PATENT SUBCLASS 251 / 186
.~.~ Piston

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

157  DF  WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8}
176  DF  .~ Spring {3}
186.~.~ Piston

DEFINITION

Classification: 251/186

(under subclass 176) Devices of the piston type.