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Filmstrip and Sound Slidefilm
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American Broadcasting Company arouse Assam Agricultural University audio-visual aids audio-visual committee audio-visual program avoid blackboard Broadcasting Company bulletin board cardboard carefully cellophane charts check list clarify classroom color degree angle develop discussion effective electric outlet equipment explain each step Extension Education field trip flannel graph flash card guide sheet illustrations important points inches Insert film instruction instructor interest JORHAT kinescope lamp large number lesson plan manual material motion pictures mounting National Broadcasting Company necessary number of students objective observe opaque projector operate organisations perform the job pertinent portable possible poster Prepare learner presentation problem procedure projected projector and screen projector lens proper purchase radio program reshow revolutions per minute room lights scotch tape script showing side of projector Silent film sound film sound slidefilm speaker specific specimens teacher teaching aids technique television turn ventilation visual aid