US PATENT SUBCLASS 181 / 248
.~.~.~ Continuous conduit

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.~.~.~ Continuous conduit {1}
249  DF  .~.~.~.~> With expansion chamber {2}

DEFINITION

Classification: 181/248

Continuous conduit:

(under subclass 247) Subject matter wherein the passage is comprised of a continuous uninterrupted conduit from its inlet to the outlet.

(1) Note. Subject matter of this subclass type may have sound absorbing material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222, 252 and 256, for similar sound absorbing devices with

sound absorbing material.