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