The carrier and the vehicle are provided with {HEAD ~ structures} which engage {TAIL ~ one} another as the vehicle is so moved so that the vehicle serves to move the carrier along the ramp 
engage
The carrier and the vehicle are provided with { HEAD ~ structures } which engage { TAIL ~ one } another as the vehicle is so moved so that the vehicle serves to move the carrier along the ramp
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH