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