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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3/00
Manually or mechanically operated teaching appliances working with questions and answers
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G09B3/06
of the multiple-choice answer type, i.e. where a given question is provided with a series of answers and a choice has to be made
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G09B3/10
wherein one set of answers is common to a plurality of questions
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