On the secondary core, a primary bobbin including a bobbin main portion covering the side peripheral surface of the core main portion and a holding portion formed integrally with and on {TAIL ~ one side} of {HEAD ~ the bobbin main portion} is formed out of an insulating synthetic resin 
On the secondary core , a primary bobbin including a bobbin main portion covering the side peripheral surface of the core main portion and a holding portion formed integrally with and on { TAIL ~ one side } of { HEAD ~ the bobbin main portion } is formed out of an insulating synthetic resin
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