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CPC
G09B3/06
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Parent Industries
G
PHYSICS
G09
Cryptography, education, displays
G09B
EDUCATIONAL OR DEMONSTRATION APPLIANCES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE MODELS PLANETARIA GLOBES MAPS DIAGRAMS
G09B3/00
Manually or mechanically operated teaching appliances working with questions and answers
Current Industry
G09B3/06
of the multiple-choice answer type
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