| http://www.w3.org/ns/prov#value | - such circumstances, it is considered that an auxiliary yoke 7 is fixed to a yoke body 6, for example, by engagement of an engaged piece 7 a provided on the auxiliary yoke 7 into an engaged opening 6 a provided in the yoke body 6, as shown in FIGS. 19 and 20. [0017] However, in the structure, there is a possibility that the engaged piece 7 a slides under a pressure on the outer peripheral wall of t
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