In {TAIL ~ order} to improve the permeance and strengthen the magnetic flux density, there exists a method of narrowing the breadth of a magnet across the circumference of {HEAD ~ the roller} from a distance extending toward the center thereof 
In { TAIL ~ order } to improve the permeance and strengthen the magnetic flux density , there exists a method of narrowing the breadth of a magnet across the circumference of { HEAD ~ the roller } from a distance extending toward the center thereof
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