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Magnetpro Multipurpose Switch Magnet, Magnet System with Max. 660 lbs Extraction Force, On/Off Magnet for Lifting, Working & Welding Positioning, Liquid Filtration, Automation, Metal Separation: Amazon.com: Industrial & Scientific
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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200A Magnetic Welding Ground Clamp, 200A On/off Adjustable Magnetic Welding Ground Clamp Rare Earth Switchable Magnet Welding Holder,Grounding Magnet Connector - Amazon.com
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Design of compact switchable magnetic grippers for the HyReCRo structure-climbing robot - ScienceDirect
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