{TAIL ~ An ignition coil} for {HEAD ~ internal combustion engines} including a primary core formed in a shape of rectangular ring and fixed on the inner peripheral edge of the bottom wall of a casing, a secondary core having a main portion of which is formed in a shape of straight beam, a primary winding assembly having a primary bobbin formed on the main portion of the secondary core, and a secondary winding assembly 
{ TAIL ~ An ignition coil } for { HEAD ~ internal combustion engines } including a primary core formed in a shape of rectangular ring and fixed on the inner peripheral edge of the bottom wall of a casing , a secondary core having a main portion of which is formed in a shape of straight beam , a primary winding assembly having a primary bobbin formed on the main portion of the secondary core , and a secondary winding assembly
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