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