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