US PATENT SUBCLASS 340 / 404.1
.~ Pneumatic-type sound producer (e.g., whistle or siren)

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

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

DEFINITION

Classification: 340/404.1

Pneumatic-type sound producer (e.g., whistle or siren):

(under subclass 384.1) Subject matter wherein the signalling means is operated by the flowing of air or other gaseous stream to produce the audible sounds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

815.72, for diverse indications having a pneumatic-type indication.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

129.01+, for electrically actuated valve.