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

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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Friction electrification scientific experiment diy technology small production electrostatic demonstration material package steam Classroom Manual

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

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

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Creative Technology Small Production Friction Experiment Brain Tiangong Primary School Kindergarten Science Experiment Toys Free Shipping

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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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