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