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LUCIEN JEAN JULES PHILIDOR SAU
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LUCIEN JEAN JULES PHILIDOR SAU
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Publication of FR509681ApublicationCriticalpatent/FR509681A/fr
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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FR509681A1919-04-251919-04-25Matériel pour l'enseignement et notamment pour l'enseignement musical
ExpiredFR509681A
(fr)