A bar code including a first linear bar code portion, and portions with two-dimensional bar codes at the ends of the first bar code portion. A separation through the first portion. The two-dimensional bar code at each end is inverted from the other end, and in an embodiment is also rotated 180.degree.,...http://www.google.es/patents/US7293713?utm_source=gb-gplus-sharePatente US7293713 - Double-sided bar code doubling as a single bar code
Double-sided bar code doubling as a single bar code
