A63J 17/00 - Definition 
Informative references
Attention is drawn to the following places, which may be of interest for search:
Controlling arrangements in circuits for electric light sources, in general | H05B 37/02 |
Electrophonic musical instruments; Instruments in which the tones are generated by electromechanical means or electronic generators, or in which the tones are synthesised from a data store | G10H |