a barcode is a graphic identifier that arranges a plurality of black bars and blanks with different widths according to certain coding rules to express a group of information. The common bar code is a parallel line pattern composed of black bars (referred to as bars) and white bars (referred to as spaces) with great differences in reflectivity.

Barcode can indicate the country of production, manufacturer, commodity name, date of production, book classification number, starting and ending place, category and date of mail, and so on, so it has been widely used in many fields such as commodity circulation, book management, postal management and banking system. 1, 8-83 Italy 84 Spain 2, 85 Cuba 858? Slovakia 3,859 Czech 86? Yugoslavia 4,865 Mongolia 5,867 North Korea 869?

Turkey 6, 87 Netherlands 88 Korea 7, 885 Thailand 888 Singapore 8, 89 India 893 Vietnam 9, 899? According to the regulations, every legal product in Indonesia should have a bar code number, and the manufacturer should apply to the National Article Coding Center for filing. Therefore, the bar code number of each product exists in the database of the national and world article coding centers, so you can query the country and manufacturer information of the product, < P > and whether it is valid through the bar code. The manufacturer information needs to be queried on the corresponding website, and the country can judge for itself by knowing the composition of the barcode. The types of commodity bar codes used in retail units are EAN-8/13, UPC-a/e UPC bar codes are mainly used in the United States and Canada, and EAN bar codes are European standards, which are used in other countries except the United States and Canada, and in China. Common is 13 digits, that is, EAN-13 bar code.