In FIG 9, angular relationships between a dust bag 34 and {HEAD ~ walls} 65, 65 of a housing 63 are achieved by creating {TAIL ~ a non rectangular housing} 
In FIG 9 , angular relationships between a dust bag 34 and { HEAD ~ walls } 65 , 65 of a housing 63 are achieved by creating { TAIL ~ a non rectangular housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL