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A UPC-A barcode symbol

A barcode is a way of storing numbers printed in a way that a computer can easily read. The first barcodes stored the numbers using lines (bars).

The word Wikipedia represented in a barcode

The first use of barcodes was to label railroad rolling stock. They became a big success when they were used in supermarket checkout systems. The first product that used a barcode was a pack of Wrigley's Juicy Fruit Gum sold on June 26, 1974. It was invented by IBM engineer George J. Laurer. Barcodes are now used for many purposes.

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