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Priority to NL7202939ApriorityCriticalpatent/NL7202939A/xx
Publication of NL7202939ApublicationCriticalpatent/NL7202939A/xx
G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B5/08—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations
G09B5/12—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations different stations being capable of presenting different information simultaneously
