A bar code reader for reading picket and ladder oriented bar codes from products a singulated product stream transported through a scanning zone. The bar code reader is comprised of a pair of raster scanners to scan for ladder oriented bar codes on the top surface of each product and a pair of line scanners...http://www.google.fr/patents/US5384450?utm_source=gb-gplus-shareBrevet US5384450 - Bar code reader for a singulated product stream
