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About metal detectors in schools cons

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Metal detectors come in a number of fundamental types, but all adhere to a basic theory: an electric cost is used to produce a magnetized wave that may be directed at the ground; if this wave comes into connection with metal, the metal begins to vibrate in a certain method, https://simoncgjhg.blog2freedom.com/26776306/top-guidelines-of-detector-metale-pret

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