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

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

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

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

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

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