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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
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FR651001D1928-03-191928-03-19Dispositif pour l'enseignement, notamment de la lecture et de l'orthographe
ExpiredFR651001A
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Blocs phonétiques pour l'enseignement de la lecture et de l'orthographe, de la grammaire et de la conjugaison, avec chiffres et signes pour le calcul