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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
G09B19/06—Foreign languages
G09B19/08—Printed or written appliances, e.g. text books, bilingual letter assemblies, charts
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FR911647D1945-01-251945-01-25Perfectionnements aux dictionnaires, lexiques et analogues
ExpiredFR911647A
(fr)