In the beginning, there was a 10-pack of Wrigley's chewing gum sporting a UPC bar code. It was passed over an NCR scanner at a Marsh supermarket in Troy, Ohio. The laser light from the scanner measured the distance between vertical bars of the bar code, thereby identifying the product. Its price was then looked up in the system and displayed. It was June 26, 1974. Bar code scanning was born, and with it the modern supermarket industry. The impact of the bar code on food retailing has been ...

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