US PATENT SUBCLASS 181 / 188
.~.~.~ Similar portions

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
177  DF  .~ Intensifying horn {11}
187  DF  .~.~ Plural intensifying portions {1}
188.~.~.~ Similar portions

DEFINITION

Classification: 181/188

(under subclass 187) Subject matter wherein the plural intensifying portions have substantially the same shape or are mirror images of one another.