Magnetic rings, bracelets and necklaces

作者: Pentti J. Tervola

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摘要: A device in the form of a ring for wearing on finger, bracelet wrist or necklace neck bears magnetic pick-up engaging ferromagnetic objects. It may include other tools such as screwdriver blades, line cutters, prying claws and like convenience having certain useful at hand when needed without encumbering hands user.

参考文章(6)