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On/Off-Switchable Strong-Hand Welding Magnetic Clamps - Max 110lbs Heavy Duty Neodymium Welding Magnets Holder, Hexagon Multi-Angle 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150° (2 PACK of Large) - - Amazon.com
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MBM Industry & Rail Tech GmbH Switchable fastening Magnets - Magswitch - MBM Industry & Rail Tech GmbH
Is there any simple, low-energy way to make a permanent magnet able to turn 'on and off' (similar to an electromagnet)? - Quora
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