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

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Science and Technology small production teaching aids homemade electric scooter children Primary School toys wholesale scientific handmade material package

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Technology small production diy small invention electric fitness robot hand-made elliptical machine technology maker works

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

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