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MUTUACTOR 4Pack Pull-Force 40lb Strong Rubber Coated Neodymium Magnet with Male Thread Stud M6, No Scratch Painted Surface High Friction Magnet Base: Amazon.com: Industrial & Scientific
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Pull force / magnetic force calculation between two disc magnets (Neodymium disc magnet, Samarium disc magnet, Alnico disc magnet, ferrite disc magnet)
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