US PATENT SUBCLASS 251 / 192
.~ Rotary valve

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}
192.~ Rotary valve

DEFINITION

Classification: 251/192

(under subclass 157) Subject matter comprising rotary valves.