| http://www.w3.org/ns/prov#value | - he track to be scanned; and an electronic circuit for deriving difference signals Pa, Pb, Pc respectively corresponding to the difference between output signals produced by the detectors of the respective detection system a, b and c, and forming a position signal Ep proportional to the sum of Pa, Pb and KPc, where K is a constant; said position signal Ep being representative of the position of sai
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