Owing to the coaxial arrangement, moreover, the two fans 54 and 66 can share in common a single motor as their driving source, which, along with the simplified structure of coupling means, leads to simplification of {HEAD ~ the apparatus} in {TAIL ~ construction} 
Owing to the coaxial arrangement , moreover , the two fans 54 and 66 can share in common a single motor as their driving source , which , along with the simplified structure of coupling means , leads to simplification of { HEAD ~ the apparatus } in { TAIL ~ construction }
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