CPC Main Group G10K 7/00 Sirens 3 direct subcodes Child Classifications Navigate with arrow keys, Enter to open G10K 7/005 G10K 7/02 in which the sound-producing member is rotated manually or by a motor (G10K7/06 takes precedence) G10K 7/06 in which the sound-producing member is driven by a fluid, e.g. by a compressed gas