| http://www.w3.org/ns/prov#value | - A self-guided vehicle as recited in claim 1 wherein the external course is defined by an energized guide wire and the improvement to the vehicle further comprises:coil means within the sensor means and straddling the wire to produce output signals proportional to the vehicle's lateral distance from both sides of the wire, the coil means including means for producing an error signal from the differ
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