An angle α is then obtained between the dust bag and wall and the space thereof is filled with {HEAD ~ pressure sensors} that create {TAIL ~ signals} used in indicating relative fullness as previously described 
create
An angle α is then obtained between the dust bag and wall and the space thereof is filled with { HEAD ~ pressure sensors } that create { TAIL ~ signals } used in indicating relative fullness as previously described
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH