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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
G09B21/02—Devices for Braille writing
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FR548997D1922-03-161922-03-16Perfectionnements dans les alphabets pour aveugles et dans leurs poinçons d'écriture
ExpiredFR548997A
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