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