Electrically-operated educational appliances (working with questions and answers G09B7/00; simulators G09B9/00; advertising or displaying in general G09F)

Child Classifications

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• G09B 5/02 with visual presentation of the material to be studied, e.g. using film strip IPC+CPC Available in IPC and CPC
• G09B 5/04 with audible presentation of the material to be studied (sound recording or reproducing G11B) IPC+CPC Available in IPC and CPC
• G09B 5/06 with both visual and audible presentation of the material to be studied +3 CPC IPC+CPC Available in IPC and CPC
• G09B 5/08 providing for individual presentation of information to a plurality of student stations since 1974 IPC+CPC Available in IPC and CPC