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Individual
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Individual
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Priority to DE19702056221priorityCriticalpatent/DE2056221A1/de
Publication of DE2056221A1publicationCriticalpatent/DE2056221A1/de
G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B7/00—Electrically-operated teaching apparatus or devices working with questions and answers
G09B7/06—Electrically-operated teaching apparatus or devices working with questions and answers 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 from the answers