SE213235C1SE218265ASE218265ASE213235C1SE 213235 C1SE213235 C1SE 213235C1SE 218265 ASE218265 ASE 218265ASE 218265 ASE218265 ASE 218265ASE 213235 C1SE213235 C1SE 213235C1
Authority
SE
Sweden
Application number
SE218265A
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Filing date
Publication date
Application filedfiledCritical
Publication of SE213235C1publicationCriticalpatent/SE213235C1/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
G09B5/10—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations all student stations being capable of presenting the same information simultaneously
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N5/00—Details of television systems
H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N5/00—Details of television systems
H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor