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Publication of FR662579ApublicationCriticalpatent/FR662579A/fr
G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
G09B29/10—Map spot or coordinate position indicators; Map reading aids
G09B29/102—Map spot or coordinate position indicators; Map reading aids using electrical means
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FR662579D1927-10-261928-10-19Perfectionnements aux appareils d'exhibition électriques
ExpiredFR662579A
(fr)