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Science and Technology small production GUI watch Japanese shadow length measurement 24 solar terms astronomical instrument handmade DIY children's teaching aids

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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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80*60*15 square 4-hole brake pad slitting machine rewinder brake friction plate

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

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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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10ml children science experiment pigment water soluble pigment Plasticine slime diy handmade soap colorant

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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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Supply excellent EXLUB PG60A synthetic gear silencer grease synthetic gear grease

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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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Friction experiment demonstrator material package trolley wheel labor-saving diy technology small production science classroom supporting

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

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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Ailunbao plastic gear silencer grease anti-wear, high temperature resistance, friction resistance, strong adhesion and no oil rejection

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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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Polymer wear-resistant friction plate hexagon clutch brake pad motor brake 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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Industrial clutch brake 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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5G 10 waterproof sealed silicone grease faucet toy water gun cylinder O-ring silicone grease paste small package lubricating grease

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Students 99 Multiplication Table Table Table Game Exercise Mind Mathematical Calculation Teaching Ads Parent-Child Interactive Educational Science and Education Toys

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

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

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Climbing monkey friction experiment diy technology small production material package kindergarten popular science hand-assembled educational toys

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Children's science popularization experiment climbing rope villain teaching aids primary school science experiment technology small production climbing monkey friction handmade

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