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