4. Office supplies; artists and teachers materials
  5. Teaching material
  6. Sensory feedback, e.g., audio-visual teaching machine

Wu T. Yiu

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Combined keyboard and electronic learning aid

Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent

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Housing for an electronic educational video system

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
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Profile ID: LFUS-PAI-P-650300

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