Each transformer 28, in association with {TAIL ~ the link} 18, thus serves to transmit {HEAD ~ signals} between the surface installation 16 and the tool in question 
Each transformer 28 , in association with { TAIL ~ the link } 18 , thus serves to transmit { HEAD ~ signals } between the surface installation 16 and the tool in question
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH