| http://www.w3.org/ns/prov#value | - As a matter of course the effective opening region C is selected from the proposed position according to the embodiment of the invention.According to this embodiment of the present invention, the first distance W.sub.1 is set to about 35 mm and the second distance W.sub.2 is set to about 45 mm.The effective opening region C is a region substantially corresponding to the magnetic head insert openin
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