Conversely, each transformer 28 also serves to transmit {HEAD ~ signals} from {TAIL ~ the corresponding tool} 12 1 to 12 4 to the surface installation 16 
Conversely , each transformer 28 also serves to transmit { HEAD ~ signals } from { TAIL ~ the corresponding tool } 12 1 to 12 4 to the surface installation 16
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