340 / | HD | COMMUNICATIONS: ELECTRICAL |
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384.1 | | AUDIBLE INDICATION {11} |
384.2 | DF | .~> Ultrasonic pest control |
384.3 | DF | .~> Simulation |
384.4 | DF | .~> Electronic siren (e.g., wail tone or yelp tone warning device) |
384.5 | DF | .~> With computer element |
384.6 | DF | .~> Piezoelectric |
384.7 | DF | .~> Electronic {3} |
385.1 | DF | .~> Explosive |
387.1 | DF | .~> Weatherproofing |
388.1 | DF | .~> Diaphragm (e.g., horn or buzzer) {7} |
392.1 | DF | .~> Percussion-type sound producer (e.g., signal chimes or bells) {15} |
404.1 | DF | .~> Pneumatic-type sound producer (e.g., whistle or siren) {2} |