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

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Homemade flute elementary school student simple musical instrument handmade diy technology small production educational science experiment teaching aids materials

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Scientific experiment diy climbing monkey physical friction technology small production student children handmade school material package

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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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Electrostatic experiment diy friction electrification material package technology small production children's electrostatic demonstration steam classroom manual

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

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3G 5g small bag lubricating grease small package silicone grease maintenance butter White bearing gear slide rail grease

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Reggio three-sided mirror three-fold mirror small kindergarten science area doll's toy teaching aids

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Xueyouma Portable Microscope Upgrade 3-in -1 Set Dual Light Source Experiment Microscopic Slide Specimen Toy

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

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Student Experiment Professional Microscope Scientific Experiment HD Optical XSP-02 Professional Teaching Children Microscope

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

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Exploration Boy Ancient Water Clock Pupil Science Experiment Toy Set DIY Handmade Science and Technology Small Production

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