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

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

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Primary and secondary school students physical teaching aids scientific material package DIY manual space solar photovoltaic power generation satellite model

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

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Science and Technology small production homemade water dispenser maker work steam science experiment toy elementary school student DIY material

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Children's Montessori Early Education Mathematics Learning Stick Color Cognitive Matching Board Wooden Stick Game Educational Toys

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Gear motor accessories 32mmX32mmX100mm billion large motor brake pad tool magazine motor friction plate

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Friction starting science experimental materials science and technology small production children's stem maker education and training equipment

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

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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

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Creative Electric wooden racing car elementary school student technology small production invention assembly scientific experiment toy handmade

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