In the illustrated embodiment, a rectangular closing member 15 for closing a third opening portion 32 formed in the casing 30 and a connector member 16 protruding from {TAIL ~ the outer wall} of the closing member 15 are molded integral with the primary bobbin 11 and {HEAD ~ the connecting portion} 14, at the free end of the connecting portion 14 
In the illustrated embodiment , a rectangular closing member 15 for closing a third opening portion 32 formed in the casing 30 and a connector member 16 protruding from { TAIL ~ the outer wall } of the closing member 15 are molded integral with the primary bobbin 11 and { HEAD ~ the connecting portion } 14 , at the free end of the connecting portion 14
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