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