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G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B15/00—Teaching music
G09B15/02—Boards or like means for providing an indication of notes
G09B15/026—Non-electrically operated
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FR1089084D1953-11-271953-11-27Matériel pour l'enseignement de la musique et du solfège et pouvant être utilisé comme jouet
ExpiredFR1089084A
(fr)