US PATENT SUBCLASS 251 / 169
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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}
158  DF  .~ With positive reduction {3}
167  DF  .~.~ Bifaced {2}
169.~.~.~ Toggle


DEFINITION

Classification: 251/169

(under subclass 167) Devices wherein the means comprises toggle mechanism.