More precisely, each transformer 28 serves to transmit {HEAD ~ signals} from {TAIL ~ the surface installation} 16 to the active portion 14 of the corresponding tool 
from
More precisely , each transformer 28 serves to transmit { HEAD ~ signals } from { TAIL ~ the surface installation } 16 to the active portion 14 of the corresponding tool
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH