DIFF Subgroup
G09B 15/04 with sound emitters
Introduced: September 1968
Title
Titles differ between systems:
IPC: with sound-emitters
CPC: with sound emitters
Full Title
Full titles differ between systems:
IPC:
Teaching music > Boards or like means for providing an indication of notes > with sound-emitters
CPC:
Teaching music (metronomes G04F5/02) > Boards or like means for providing an indication of notes > with sound emitters
No child classifications to compare. This is a leaf node in both IPC and CPC.