To achieve angular disposition between {HEAD ~ the wall} and {TAIL ~ dust bag}, tapers, angular walls, ribs or combinations thereof are contemplated 
To achieve angular disposition between { HEAD ~ the wall } and { TAIL ~ dust bag } , tapers , angular walls , ribs or combinations thereof are contemplated
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH