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