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