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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
G09B21/00—Teaching, or communicating with, the blind, deaf or mute
G09B21/001—Teaching or communicating with blind persons
G09B21/006—Teaching or communicating with blind persons using audible presentation of the information
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FR481669D1915-05-061916-05-05Perfectionnements dans les dispositifs pour permettre aux aveugles de lire et pour d'autres usages analogues
ExpiredFR481669A
(fr)