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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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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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Friction starting science experimental materials science and technology small production children's stem maker education and training equipment

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Water level alarm DIY puzzle assembled experimental model educational toy technology small production scientific invention

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Polymer wear-resistant friction plate hexagon clutch brake pad motor brake accessories

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Supply excellent EXLUB PG60A synthetic gear silencer grease synthetic gear grease

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

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Students Assembled Tree Climbing Panda Science Teaching Aware Friction Rope Climbing Experimental Equipment Technology Small Production Material Package

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Villain grinding handmade diy material technology creative small production student children science experiment innovation small invention

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Science experiment teaching aids for primary school students self-made water purifier filter water science and technology small production Steam science and education frontier

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117*83*19 Brake Friction Plate Brake Pad for Fiat Allis Loader

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

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

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

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