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PCE
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CPC Subgroup
G09B 5/04

with audible presentation of the material to be studied (sound recording or reproducing G11B)

Full Title

Electrically-operated educational appliances (working with questions and answers G09B7/00; simulators G09B9/00; advertising or displaying in general G09F) > with audible presentation of the material to be studied (sound recording or reproducing G11B)