US PATENT SUBCLASS 181 / 255
.~.~.~ Expansion chamber

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}
247  DF  .~.~ Straight-through passage {4}
255.~.~.~ Expansion chamber

DEFINITION

Classification: 181/255

Expansion chamber:

(under subclass 247) Subject matter having enlarged chambers intermediate the length of the through passage.