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Industrial clutch brake friction plate

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Villain grinding handmade diy material technology creative small production student children science experiment innovation small invention

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Electrostatic experiment diy friction electrification material package technology small production children's electrostatic demonstration steam classroom manual

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

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

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

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Friction and Electricity Science Experiment Technology Small Production Student Handmade diy Electrostatic Materials Kindergarten Teaching Aids

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