When was the first commercial barcode scanner used in a retail store to scan a product for purchase?

The retail landscape has been transformed by countless innovations throughout history. Some inventions have so fundamentally changed the shopping experience that we can hardly imagine life without them. This poll tests your knowledge about a pivotal retail technology that revolutionized inventory management and checkout processes worldwide. Do you know when this game-changing invention first appeared in stores?

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1974, at Marsh Supermarket in Troy, Ohio, scanning a pack of Wrigley's chewing gum
1969, at Kroger in Cincinnati, Ohio, scanning a carton of Coca-Cola
1981, at Walmart in Rogers, Arkansas, scanning a box of Tide laundry detergent
1978, at Sears in Chicago, Illinois, scanning a Craftsman wrench set