US PATENT SUBCLASS 181 / 249
.~.~.~.~ With 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}
248  DF  .~.~.~ Continuous conduit {1}
249.~.~.~.~ With expansion chamber {2}
250  DF  .~.~.~.~.~> And side branch
251  DF  .~.~.~.~.~> And multi-passage

DEFINITION

Classification: 181/249

With expansion chamber:

(under subclass 248) Subject matter having enlarged chambers intermediate the length of the through passage.