On {TAIL ~ the outer peripheral surface} of the bobbin main portion is wound with {HEAD ~ a primary windings} 
On { TAIL ~ the outer peripheral surface } of the bobbin main portion is wound with { HEAD ~ a primary windings }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD