US PATENT SUBCLASS 181 / 180
.~.~ Material

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
177  DF  .~ Intensifying horn {11}
180.~.~ Material

DEFINITION

Classification: 181/180

(under subclass 177) Subject matter wherein the horn is constructed of a specific material or materials.