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