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

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Technology small production tornado beauty connector sand leakage experiment leakage connector with 200 ml special bottle

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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

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Science and technology small production manual pressure well experimental materials package pressure well self-made water pump primary school education equipment

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

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63*45*15 circlip type slitting machine iron sheet brake pad DBG DBH air pressure disc brake friction plate

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diy kindergarten Elementary School students' science and education toys scientific small production friction generation electric electrostatic experiment handmade materials

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

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Wholesale White Special Grease Mechanical Bearings Reduce Friction High Temperature Lubricant Metal Curing Lubrication

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