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