In a further preferred embodiment, the exit trough may be covered by {HEAD ~ an exit cover} which includes {TAIL ~ a cover plate} hingedly mounted to a pivot plate 
includes
In a further preferred embodiment , the exit trough may be covered by { HEAD ~ an exit cover } which includes { TAIL ~ a cover plate } hingedly mounted to a pivot plate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH