Patent classifications
G
PHYSICS
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G09
EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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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
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21/00
Teaching, or communicating with, the blind, deaf or mute
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G09B21/04
Devices for conversing with the deaf-blind
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