This invention is performed to obtain the characteristics required for the magnetic roller, namely the stability of a position for {HEAD ~ the magnetic poles} by increasing the magnetic characteristics and improving {TAIL ~ the permeance} 
by improving
This invention is performed to obtain the characteristics required for the magnetic roller , namely the stability of a position for { HEAD ~ the magnetic poles } by increasing the magnetic characteristics and improving { TAIL ~ the permeance }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL