{HEAD ~ An upper retaining member} is linked to {TAIL ~ the upper ramp} and is movable into and out of the sheet feed plane in alternating relation to the upper ramp 
is linked to
{ HEAD ~ An upper retaining member } is linked to { TAIL ~ the upper ramp } and is movable into and out of the sheet feed plane in alternating relation to the upper ramp
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH