It may be desirable to position a sensor or {HEAD ~ control module} between {TAIL ~ the sand face completion sections} 204 and 240 , generally in a region indicated as 206 in FIG 2 
between
It may be desirable to position a sensor or { HEAD ~ control module } between { TAIL ~ the sand face completion sections } 204 and 240 , generally in a region indicated as 206 in FIG 2
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH