US PATENT SUBCLASS 181 / 232
.~.~ Separate distinct units serially connected

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}
232.~.~ Separate distinct units serially connected

DEFINITION

Classification: 181/232

Separate distinct units serially connected:

(under subclass 212) Subject matter provided with a plurality of sound attenuating devices, each either of duplicate or different design and connected one after the other in the down-stream direction.