4. Office supplies; artists and teachers materials
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Magic sound book

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

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Medical training aid for discriminating auscultory sounds

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

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Multimedia curriculum device

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

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