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Science and technology small production pole woodpecker science experiment package 7-14 years old primary school students friction physics experiment toy

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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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Crowdstone Technology Small Making Small Invention Children's Handmade Scientific Experiment Educational Toy Model Stone-throwing Chariot

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

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Scientific Experiment Obstacle Avoidance Car Robot Science and Technology Small Production Primary School Students DIY Manual Intelligent Experiment Small Invention

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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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Machine tool press punch friction plate round friction block brake block punch 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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Volcanic eruption first grade science experiment children's creative handmade small production volcanic mold shell science and education toys

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Manufacturers supply punch mechanical friction block buffer layer press friction block high wear-resistant friction block production

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Electronic cannon DIY homemade technology small production handmade gun science and technology experiment science and education air pressure launch stem

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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 colorful full-color light circuit experimental toys electromagnetic induction science small experimental material package

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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[Star River] cable-stayed bridge diy technology small production mechanics physics experiment school education training material package

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Hand spray butter lubricating grease high temperature resistant door lock cylinder door hinge bearing gear abnormal noise anti-rust spray

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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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Science and technology small production self-made Periscope Junior High School optical reflection experiment DIY light refraction propagation popular science model

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

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

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Scientific Experiment diy Friction Electrogeneration Material Package Electrostatic Demonstration Technology Small Production Student Children Handmade

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Self-made Submarine Technology Small Handmade Scientific Experimental Equipment Ups and Downs Diving diy Teaching Aids Materials Toys

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Super high temperature resistant grease high speed bearing mechanical wear-resistant Butter automobile industrial gear electric hammer factory wholesale

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DIY creative technology small production electric windmill house elementary school students educational science and education toys handmade work material package

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

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DIY Wind Vane Self-made Wind Meter Small Production DIY Science and Technology Science Experiment Hand-assembled Student Teaching Aids New Products

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