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Mechanical Dragon Assembly Model Children's Scientific Experimental Equipment Set Diy Crank Arm Transmission Structure

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physical Crazy mechanical bug children's scientific handmade gizmo wooden assembly gear transmission principle model material

physical Crazy mechanical bug children's scientific handmade gizmo wooden assembly gear transmission principle model material

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Small production vibration sound transmission principle scientific experiment children's handmade materials diy soil phone

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High purity metal fine silver wire/experimental DIY/scientific research/Ag ≥ 99.99%

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