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Manually or mechanically operated teaching appliances working with questions and answers
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Industry
CPC
G09B3/00
This industry / category may be too specific. Please go to a parent level for more data
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
Current Industry
G09B3/00
Manually or mechanically operated teaching appliances working with questions and answers
Sub Industries
G09B3/02
of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student
G09B3/04
of chart form
G09B3/045
with invisibly printed correct answer; the answer being rendered visible by special optical means
G09B3/06
of the multiple-choice answer type
G09B3/08
of chart form
G09B3/085
with invisibly printed correct answer; the answer being rendered visible by special optical means
G09B3/10
wherein one set of answers is common to a plurality of questions
G09B3/12
of chart form
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CPC
G09B3/00
