The traction unit is provided with a counter traction unit with {HEAD ~ at least two traction ropes} which extend outwardly out of {TAIL ~ the lower frame} and are connected to the top of the upper frame 
extend outwardly out of
The traction unit is provided with a counter traction unit with { HEAD ~ at least two traction ropes } which extend outwardly out of { TAIL ~ the lower frame } and are connected to the top of the upper frame
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH