Data processing apparatus; time recording apparatus; electronic notice boards; intercommunication apparatus; electroacoustic composite member; metronomes; measuring instruments; audiovisual teaching apparatus; acoustic pickup; thief prevention installations, electric

Tonality rectifying device (accordatura device); kettledrum frames; musical instruments; intensity regulators for mechanical pianos; turning apparatus for sheet music; pedals for musical instruments; mutes for musical instruments; dampers for musical instruments; music stands; musical boxes