Which invention, first patented in 1974, revolutionized retail customer experience by enabling personalized product identification and pricing, eventually leading to recommendation systems?

Throughout history, certain inventions and discoveries have revolutionized retail customer experience. These innovations fundamentally changed how consumers interact with products and services, creating entirely new shopping paradigms. This trivia question explores a groundbreaking technology that transformed retail by enabling personalized recommendations long before AI became mainstream.

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Universal Product Code (UPC) barcode scanner
Electronic cash register with customer database
Magnetic stripe loyalty card
Digital product recommendation kiosk