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

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

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Portable Children's Microscope 180 Times High Definition Scientific Experiment Toy Set Xueyouma Cross-border Hot Selling Puzzle

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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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Homemade submarine diy science and technology small production scientific toys salvage shipwreck teaching experimental equipment teaching aids wholesale

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Industrial clutch brake friction plate

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Montessori Math Educational Aids Wooden Number Computing Clip Beads Matching Game Number Cognition Matching Puzzle

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Science and technology small production homemade Periscope optical physics science experiment DIY assembled Periscope intelligence toys

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Douyin popular radish telescope 8 Times single tube 3-section telescopic adjustable focus children's educational science and education boys and girls toys

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Scientific experiment diy bear climbing rope friction experiment steam technology small production small invention material package suit

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Kindergarten learning button zipper teaching aids button zipper toy non-woven area material homemade

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

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stem science experiment toy hydraulic mechanical primary school student arm engineering series science and technology gift organization small production

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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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Children's kindergarten Elementary School students physics science experiment small production small invention electrostatic friction electric electrostatic experiment

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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 Observation Tank Elton Multifunctional Observation Barrel Kindergarten Primary School Students Outdoor Exploration Educational Children's Toys

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