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