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

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Fruit power generation experiment set scientific experiment materials student science and technology training class teaching tools hand-made

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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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Children's Montessori Early Education Mathematics Learning Stick Color Cognitive Matching Board Wooden Stick Game Educational Toys

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Science and Technology small production diy electric sliding aircraft children's science experiment teaching aids student handmade stem device material

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Industrial clutch brake friction plate

Industrial clutch brake friction plate

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

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

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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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Cross-border Hot-selling Children's Science and Education Cognitive Toys Human Organ Structure Model Assembled Matching Medical Early Education Men and Women

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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 diy material package small invention hand-made dehydrator dryer elementary school students scientific experiment

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Kindergarten DIY Sewage Filtration Self-made Water Purifier Scientific Small Experiment Set Device System Material Purification Teaching Aware

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Self-made dynamometer student spring scale technology small production tension device children's science small experiment material package teaching aids

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

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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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Science and technology DIY balance scale small production primary school children science experiment handmade lesson puzzle stem educational supplies

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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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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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Everest Kaiyue 500X brake pad 500F 525X 525F disc brake leather ZF500GY ZF500 brake friction

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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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Student Science and Technology Handmade DIY Telegraph Small Making Model Children's Maker Education STEM Scientific Experimental Materials

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

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Scientific small production diy rocket launcher model students physics experiment enlightenment learning teaching aids

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3# lithium grease extreme pressure composite lithium grease universal lithium butter industrial lithium grease

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