US PATENT SUBCLASS 181 / 178
.~.~ Collapsible

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
177  DF  .~ Intensifying horn {11}
178.~.~ Collapsible

DEFINITION

Classification: 181/178

(under subclass 177) Subject matter wherein the horn includes means to effect a reduction in size from an operative condition to an inoperative condition, e.g., telescopes or folds.