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2. magnetic or temporary magnet is a magnet that occurs in the same way, with a permanent magnet. But the steel used is just an ordinary soft steel. When the grid feed- Power to the coil of iron bars around a thousand young. Light steel bars, there will be a magnet to the conditions immediately, but when stopping power to. Magnetic power will disappear, they needed relay device. Ultrasonic, electric Bell, etc., noi
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