Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers (loudspeakers or like acoustic electromechanical transducers H04R)

Child Classifications

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• G10K 9/02 driven by gas; e.g. suction operated
• G10K 9/08 driven by water or other liquids
• G10K 9/10 driven by mechanical means only
• G10K 9/12 electrically operated
• G10K 9/18 Details, e.g. bulbs, pumps, pistons, switches or casings