US PATENT SUBCLASS 181 / 293
.~.~ With channels or cavities in surface layer

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
284  DF  .~ Sound absorbing panels {8}
293.~.~ With channels or cavities in surface layer

DEFINITION

Classification: 181/293

With channels or cavities in surface layer:

(under subclass 284) Subject matter wherein the outer face is formed with channels or cavities.