an air flow passage through which grass cuttings are discharged from {HEAD ~ said cutting chamber} in {TAIL ~ a current} of air 
in
an air flow passage through which grass cuttings are discharged from { HEAD ~ said cutting chamber } in { TAIL ~ a current } of air
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH