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

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

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

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

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

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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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Gear motor accessories 32mmX32mmX100mm billion large motor brake pad tool magazine motor friction plate

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Bamboo people sixth grade handmade toy material diy small bamboo people double battle position Zhiyi game with pk table

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

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

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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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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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Industrial clutch brake friction plate

Industrial clutch brake friction plate

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

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

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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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Science and Technology small production GUI watch Japanese shadow length measurement 24 solar terms astronomical instrument handmade DIY children's teaching aids

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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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Climbing monkey friction experiment diy technology small production material package kindergarten popular science hand-assembled educational toys

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Machine tool press punch friction plate round friction block brake block punch accessories

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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 self-made Periscope Junior High School optical reflection experiment DIY light refraction propagation popular science model

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

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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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100ml magic water sprite solution magic water baby special pigment handmade ocean baby supplement

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

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Homemade amphibious vehicle Wind boat technology small production materials small invention handmade technology waste utilization

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

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Pupil Experimental Pigment 10ml Children's Science Experimental Color Hand Tone Slime Pigment DIY Material

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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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