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Friction electrification scientific experiment diy technology small production electrostatic demonstration material package steam Classroom Manual

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Scientific experiment diy climbing monkey physical friction technology small production student children handmade school material package

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Creative Technology Small Production Friction Experiment Brain Tiangong Primary School Kindergarten Science Experiment Toys Free Shipping

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Frictional electrification science experiment diy technology small production electrostatic demonstration material package steam classroom manual

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