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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
G09B17/00—Teaching reading
Landscapes
Engineering & Computer Science
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Physics & Mathematics
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Educational Administration
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Theoretical Computer Science
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FR520237A1920-07-101920-07-10Perfectionnements dans les appareils instructifs
ExpiredFR520237A
(fr)