Each movable member (1) has a disk (6) which is mounted free to rotate about an axis (5) and which includes an annular area (7) of radial stripes (8) together with three concentric coding and read areas (9, 10, 11) having holes therethrough. The read station is equipped with a compressed air blast nozzle...http://www.google.de/patents/US4719449?utm_source=gb-gplus-sharePatent US4719449 - Transport apparatus for transporting part-carrying members to various work stations and for reading data encoded on said part-carrying member
