{HEAD ~ The pair} of shielding plates 17 and 18 divides the inside of {TAIL ~ the outer cylindrical casing} 4 in front and rear and is provided with one or more air holes 15 and 16 at the outer circumferential section or at the central section 
{ HEAD ~ The pair } of shielding plates 17 and 18 divides the inside of { TAIL ~ the outer cylindrical casing } 4 in front and rear and is provided with one or more air holes 15 and 16 at the outer circumferential section or at the central section
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