a carrier located on said inclined ramp so as to be capable of being elevated from adjacent to {HEAD ~ the lower end} thereof to adjacent to {TAIL ~ the upper end} thereof, 
to adjacent to
a carrier located on said inclined ramp so as to be capable of being elevated from adjacent to { HEAD ~ the lower end } thereof to adjacent to { TAIL ~ the upper end } thereof ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH