Optionally a scabbard may be tapered to prevent {HEAD ~ a pipe end} from contacting or damaging {TAIL ~ the reader apparatus} 456 and, as shown in FIG 13B, stops 454 a may be provided to achieve this 
from damaging
Optionally a scabbard may be tapered to prevent { HEAD ~ a pipe end } from contacting or damaging { TAIL ~ the reader apparatus } 456 and , as shown in FIG 13B , stops 454 a may be provided to achieve this
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH