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

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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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Scientific experiment suit primary school children's handmade diy technology small production friction labor-saving Montessori education

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Science Experiment Solar Fan Children's Handmade Equipment Material Package Science and Technology Small Making Small Invention Science and Education Frontier

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

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

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Friction electrification scientific experiment diy technology small production electrostatic demonstration material package steam Classroom Manual

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

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

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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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Children's kindergarten Elementary School students physics science experiment small production small invention electrostatic friction electric electrostatic experiment

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

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Maxwell rolling pendulum stem technology small production diy physical experiment gravity model popular science equipment wholesale

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

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Creative Technology small production friction experiment brain Tiangong Primary School kindergarten science popularization experiment toy 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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