When the opening portion of the casing is closed with the closing member, both end faces in the longitudinal direction of the secondary core formed in the primary bobbin face to {HEAD ~ the inside peripheral surfaces} of {TAIL ~ the primary core} 
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When the opening portion of the casing is closed with the closing member , both end faces in the longitudinal direction of the secondary core formed in the primary bobbin face to { HEAD ~ the inside peripheral surfaces } of { TAIL ~ the primary core }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL