The electric power supplies are provided with respective positioning and actuating devices controlled to actuate them independently from one another during setting in contact and {HEAD ~ detachment} of {TAIL ~ the bars} 
of
The electric power supplies are provided with respective positioning and actuating devices controlled to actuate them independently from one another during setting in contact and { HEAD ~ detachment } of { TAIL ~ the bars }
OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL