More particularly, the invention pertains to supplemental power supplies which can inject electrical energy into {HEAD ~ a pair} of {TAIL ~ conductors} during selected time intervals 
of
More particularly , the invention pertains to supplemental power supplies which can inject electrical energy into { HEAD ~ a pair } of { TAIL ~ conductors } during selected time intervals
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH