US PATENT SUBCLASS 181 / 250
.~.~.~.~.~ And side branch

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  DF  .~.~.~.~ With expansion chamber {2}
250.~.~.~.~.~ And side branch

DEFINITION

Classification: 181/250

And side branch:

(under subclass 249) Subject matter having cushion, acoustic filter, or resonator chambers in communication with the through passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

266, 273 and 276, for similar devices with side branch chamber.