This causes the dispersion distribution patterns of magnetic flux such as the shape of magnet poles and {TAIL ~ the position} of the magnet pole relative to the circumferential direction of the roller shape magnetic body, thereby causing {HEAD ~ an undesirable decrease} of the performance of said roller shape magnetic body 
This causes the dispersion distribution patterns of magnetic flux such as the shape of magnet poles and { TAIL ~ the position } of the magnet pole relative to the circumferential direction of the roller shape magnetic body , thereby causing { HEAD ~ an undesirable decrease } of the performance of said roller shape magnetic body
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