The secondary core is preferably secured to {HEAD ~ the primary bobbin} by {TAIL ~ the insert resin molding process} at the time of molding of the primary bobbin 
by
The secondary core is preferably secured to { HEAD ~ the primary bobbin } by { TAIL ~ the insert resin molding process } at the time of molding of the primary bobbin
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH