A stationary optical scanning system for the decoding of a plurality of optically readable information bearing symbols encoded using at least first and second different optical codes, and for the detection of a plurality of optical targets having at least first and second different target configurations...http://www.google.de/patents/US5510603?utm_source=gb-gplus-sharePatent US5510603 - Method and apparatus for detecting and decoding information bearing symbols encoded using multiple optical codes
