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

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One-piece air-powered car scientific experiment toy STEAM small production maker training DIY material

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

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Microscope Mini small children's three-in-one multifunctional convenient educational toys

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

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Elementary School student science experiment playing teaching aids wind car Children's handmade technology small production small invention diy material

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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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Air pressure disc brake friction plate for printing machine paper cutter industrial machinery air pressure disc brake pad

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Industrial clutch brake friction plate

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Everest Kaiyue 500X brake pad 500F 525X 525F disc brake leather ZF500GY ZF500 brake friction

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Science and technology small production pole woodpecker science experiment package 7-14 years old primary school students friction physics experiment toy

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4800 times HD children primary and secondary school students scientific experiment optical microscope educational toys suit wholesale

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

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Scientific experiment suit primary school children's handmade diy technology small production friction labor-saving Montessori education

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

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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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Maxwell rolling pendulum stem technology small production diy physical experiment gravity model popular science equipment wholesale

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Hand spray butter lubricating grease high temperature resistant door lock cylinder door hinge bearing gear abnormal noise anti-rust spray

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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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5G 10 waterproof sealed silicone grease faucet toy water gun cylinder O-ring silicone grease paste small package lubricating grease

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