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