demagnetizer
  去磁器
  demagnetizer
  去磁裝置
  demagnetizer
  消磁器
  De·mag·net·ize v. t.
  1. To deprive of magnetic properties; to render nonmagnetic. See Magnetize.
     If the bar be rapidly magnetized and demagnetized.   --Am. Cyc.
  2. To free from mesmeric influence; to demesmerize. [archaic]
  -- De*mag*net*i*za*tion, n. -- De*mag*net*i*zer n.
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