In this regard, {HEAD ~ the cross section} of the periphery of the housing 63 typifies {TAIL ~ a trapezoid} while the dust bag cross section is maintained as a rectangle 
typifies
In this regard , { HEAD ~ the cross section } of the periphery of the housing 63 typifies { TAIL ~ a trapezoid } while the dust bag cross section is maintained as a rectangle
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH