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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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Children's scientific experiment pigment English label pigment material water-soluble pigment diy handmade Science and Technology small production

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

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200 PCs mixed gear bag plastic transmission toy car robot DIY accessories small making plastic gear set

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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 stethoscope kindergarten primary school science small experiment DIY assembly manual invention experimental materials

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Science and technology small production STEM education maker handmade scientific experiment teaching aids diy assembly material package kit wholesale

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

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

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

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

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Electric hammer grease impact drill gear maintenance oil power tool lubricating grease friction resistance long life manufacturers

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Kindergarten DIY Sewage Filtration Self-made Water Purifier Scientific Small Experiment Set Device System Material Purification Teaching Aware

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

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

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

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

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3# lithium grease extreme pressure composite lithium grease universal lithium butter industrial lithium grease

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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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Friction power generation electric science experiment technology small production student handmade diy electrostatic material kindergarten teaching aids

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