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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5/00
Electrically-operated educational appliances
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G09B5/06
with both visual and audible presentation of the material to be studied
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G09B5/067
Combinations of audio and projected visual presentation, e.g. film, slides
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