CPC Subgroup
G10K 9/02 driven by gas; e.g. suction operated
Full Title
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) > driven by gas; e.g. suction operated
2 direct subcodes
Child Classifications
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