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diy handmade technology small production creative vacuum cleaner student scientific experiment invention handmade assembled teaching aids materials

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Xueyouma Portable Microscope Upgrade 3-in -1 Set Dual Light Source Experiment Microscopic Slide Specimen Toy

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

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

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Super high temperature resistant grease high speed bearing mechanical wear-resistant Butter automobile industrial gear electric hammer factory wholesale

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

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Magic water elf water baby children's pearlescent solution toy suit diy handmade material toy

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

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Homemade amphibious vehicle Wind boat technology small production materials small invention handmade technology waste utilization

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100ml magic water sprite solution magic water baby special pigment handmade ocean baby supplement

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Scientific Experiment Diy Thermometer Technology Small Production Interesting Material Package Kindergarten Children's Handmade Maker Teaching Aware

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

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8cm bamboo Primary School students color counting stick 100 children's toys arithmetic stick counting stick math stick learning tool

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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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Bamboo people sixth grade handmade toy material diy small bamboo people double battle position Zhiyi game with pk table

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10ml children's scientific experiment food coloring diy handmade rubber color slime Crystal mud color pigment

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Simulation traffic light toy live voice broadcast traffic lights little boy early education sound and light toy ornaments

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800g keg general grease excavator loader butter construction machinery friction parts lubrication anti-rust

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

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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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Air pressure disc DBS DBK brake friction plate multi-point round RE old paper cutter brake pad

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Machine tool press punch friction plate round friction block brake block punch accessories

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Science and technology small production DIY colorful full-color light circuit experimental toys electromagnetic induction science small experimental material package

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Industrial clutch brake friction plate

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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Scientific experiment diy climbing monkey physical friction technology small production student children handmade school material package

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DIY creative technology small production electric windmill house elementary school students educational science and education toys handmade work material package

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Science and technology small production diy material package small invention hand-made dehydrator dryer elementary school students scientific experiment

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