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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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Homemade submarine diy science and technology small production scientific toys salvage shipwreck teaching experimental equipment teaching aids wholesale

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10ml children's scientific experiment food coloring diy handmade rubber color slime Crystal mud color pigment

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

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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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Science and technology small production diy material package small invention hand-made dehydrator dryer elementary school students scientific experiment

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Technology small production tornado beauty connector sand leakage experiment leakage connector with 200 ml special bottle

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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

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800g keg general grease excavator loader butter construction machinery friction parts lubrication anti-rust

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

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Science and Technology Small Production DIY Creative Teaching Science Experiment Student Small Invention Electric Jeep Off-road Vehicle Material Package

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