US PATENT SUBCLASS 340 / 388.4
.~.~ With resonance chamber

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

384.1  DF  AUDIBLE INDICATION {11}
388.1  DF  .~ Diaphragm (e.g., horn or buzzer) {7}
388.4.~.~ With resonance chamber

DEFINITION

Classification: 340/388.4

With resonance chamber:

(under subclass 388.1) Subject matter provided with an air space or volume adapted to vibrate at a specific tuned frequency to amplify the produced sounds.