US PATENT SUBCLASS 181 / 193
.~.~.~ Spiral sound path

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
177  DF  .~ Intensifying horn {11}
192  DF  .~.~ Particular shape of the horn {3}
193.~.~.~ Spiral sound path

DEFINITION

Classification: 181/193

(under subclass 192) Subject matter wherein the wall of the horn is arranged to provide a spiral sound path.