second detector means electrically coupled to said first coil means for amplitude detecting {HEAD ~ changes} in {TAIL ~ RF signals} generated across a right sensor segment of said first coil means, and for generating a right output pulse 
in
second detector means electrically coupled to said first coil means for amplitude detecting { HEAD ~ changes } in { TAIL ~ RF signals } generated across a right sensor segment of said first coil means , and for generating a right output pulse
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH