US PATENT SUBCLASS 340 / 404.3
.~.~ With valve

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

384.1  DF  AUDIBLE INDICATION {11}
404.1  DF  .~ Pneumatic-type sound producer (e.g., whistle or siren) {2}
404.3.~.~ With valve

DEFINITION

Classification: 340/404.3

With valve:

(under subclass 404.1) Subject matter comprising means for regulating the flow of air or other gaseous stream thereby controlling the effect of the produced sounds.