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Amazon.com: Master Magnetics COW-RUM5CX12 Cow Magnet, Ultimate Heavy Duty Ru-Master 5, Steel Ring and Ferrite, 0.75" Diameter, 3.375" Length, Black and Silver (Pack of 12) : Industrial & Scientific
Twitter 上的 Weird & Interesting:"Cows are fed magnets that stay in their stomach for life to collect metal objects like nails or barbed wire that the cow will occasionally eat, thus preventing
Amazon.com: Master Magnetics COW-CP6X50BX New Ferrite Cow Magnet, 0.625" Diameter, 3" Length, Black (Pack of 50) : Industrial & Scientific
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For cows, a magnet one day can keep the surgeon away – A new I don't know thing for curious kids – 2 New Things
Magnetic Cow Magnets
Cow Magnet ~ Heavy Duty
Amazon.com: Master Magnetics COW-RUM5CX3BX Cow Magnet, Ultimate Heavy Duty Ru-Master 5, Steel Ring and Ferrite, 0.75" Diameter, 3.375" Length, Black and Silver (Pack of 3) : Industrial & Scientific