Diversification in the international product code

This is a careful examination of the international product code simbologies. Generally they are horizontal with alternate vertical, dark and clear bars developing a two- dimensional structure codified only breadthwise: very important for decodifying is the breadthratio. Some of the simbologies, i.e. Codabar, 39 code, two of five area-numerical satisfying special requirements; hence their extent to libraries, hospitals, identity card numbering till to secret service defence. At present optical reading instruments, more and more perfect and competitive, with a better printing are giving the code scansion nearly free from mistakes.