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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
G09B19/00—Teaching not covered by other main groups of this subclass
G09B19/02—Counting; Calculating
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Business, Economics & Management
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Engineering & Computer Science
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Entrepreneurship & Innovation
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Physics & Mathematics
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Educational Administration
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General Physics & Mathematics
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Theoretical Computer Science
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FR442530D1912-04-131912-04-13Boulier-compteur pour l'enseignement des chiffres, des nombres et du calcul
ExpiredFR442530A
(fr)