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

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Exploration Boy Ancient Water Clock Pupil Science Experiment Toy Set DIY Handmade Science and Technology Small Production

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

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117*83*19 Brake Friction Plate Brake Pad for Fiat Allis Loader

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Scientific Experiment diy Friction Electrogeneration Material Package Electrostatic Demonstration Technology Small Production Student Children Handmade

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

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