A linear position measurement system including a linear member and a relatively movable member. The linear member includes a plurality of serpentine electrical conductors, each representing one bit of a multiple bit Gray code. At any longitudinal position of the movable member, an inductor in the movable...http://www.google.fr/patents/US4014015?utm_source=gb-gplus-shareBrevet US4014015 - Absolute digital position measurement system
