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By changing the current electric which would react to the Electromagnet magnetic to adhere magnetic metal such as tacks and nails. It could not only make easier to take nails out of board or the wall but it can also increase the service life of nails. Making a more convenient life.
Yanshan University
Qin Huang Dao, China
li Xu,
Yanshan University
Jian Qiao,
Yanshan University
Xumeng Liu,
Yanshan University
Yibo Wang,
Yanshan University
