An elongate drive shaft extends from {HEAD ~ an engine mounted fore} of {TAIL ~ the concavity} to the impeller 
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An elongate drive shaft extends from { HEAD ~ an engine mounted fore } of { TAIL ~ the concavity } to the impeller
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH