As far back as 1960s, the barcodes were used in industrial work environments. In the early 1970s, common barcodes started appearing on grocery shelves. To automate the process of identifying grocery items, UPC barcodes were placed on products and were used to mechanize the process of checking out in store. They are in use today also for allotment, supply chain, retail stores, apparel shops, book stores, movie galleries and libraries etc.
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