Cartridge 24 preferably includes {HEAD ~ a lip seal} that prevents {TAIL ~ ingress} of dust into the cartridge 
Cartridge 24 preferably includes { HEAD ~ a lip seal } that prevents { TAIL ~ ingress } of dust into the cartridge
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH