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Multi-layer electromagnetic spring with tunable negative stiffness for semi-active vibration isolation - ScienceDirect
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Amazon.com: RIGOR 23026 Adjustable Oil Filter Wrench, 3-Jaw Adjustable Magnetic Oil Filter Wrench, 3/8" Drive, 2.4" to 3.6" Range, Include 1/2" F to 3/8" M Drive Adapter : Automotive
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Figure 2 from Electromagnetic actuator with ferromagnetic disk and magnetic spring suspension | Semantic Scholar
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