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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
G09B15/08—Practice keyboards
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FR517338A1919-10-311919-10-31Dispositif pour l'enseignement de la musique instrumentale
ExpiredFR517338A
(fr)