Alternatively the sensor includes a bar code reader that reads {HEAD ~ a code} on, for example, {TAIL ~ the spool} of wire, an analog proximity detector, a plurality of proximity detectors, and a displacement sensor 
on
Alternatively the sensor includes a bar code reader that reads { HEAD ~ a code } on , for example , { TAIL ~ the spool } of wire , an analog proximity detector , a plurality of proximity detectors , and a displacement sensor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH