US PATENT SUBCLASS 181 / 237
.~.~ With pressure relief safety valve

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
212  DF  .~ Muffler, fluid conducting type {25}
237.~.~ With pressure relief safety valve

DEFINITION

Classification: 181/237

With pressure relief safety valve:

(under subclass 212) Subject matter wherein there is provided a valve responsive to relieve excess pressure to the atmosphere.

SEE OR SEARCH CLASS

137, Fluid Handling,

455+, for valves responsive to change in line condition.