Which grocery store first used the modern barcode scanner in a commercial transaction, marking the beginning of the UPC barcode revolution in retail?

The retail landscape has been transformed by countless technological innovations throughout history. Some inventions revolutionized how we shop, while others changed how merchants track inventory and process transactions. This pivotal invention from the 1970s fundamentally changed retail forever, transforming product tracking and speeding up checkout lines worldwide. Test your knowledge about this groundbreaking retail technology!

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Marsh Supermarket in Troy, Ohio (1974)
Kroger Supermarket in Cincinnati, Ohio (1972)
Safeway Store in San Francisco, California (1975)
A&P Grocery in New York City, New York (1973)