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Amazon.com: Electromagnetic Induction Coil, Demonstration Primary and Secondary Coil, Cylindrical Magnet Experiment Instrument for Physics Teaching : Industrial & Scientific
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Amazon.com: Super Strong Neodymium Magnet 1/2" x 3" NdFeB Magnet Cylinder, The World's Strongest & Most Powerful Rare Earth Magnets by Applied Magnets : Industrial & Scientific
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