Science technology small-scale children's scientific experiment educational toys materials handmade earthquake alarm equipment
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Science and technology small invention self-made earthquake alarm puzzle assembled model equipment scientific experiment diy
$2,209.21
Product Name: Science and Technology Small Production: Earthquake Alarm
Weight: about 55g
Dimensions: 8*6*12.5cm
Packing: opp self-sealing bag
General knowledge of seismograph: In 132 AD, Zhang...
