Which retail technology innovation was first patented by Norman Joseph Woodland and Bernard Silver in 1952, but didn't see widespread retail adoption until the 1970s?

The retail landscape has been transformed by numerous technological breakthroughs over the decades. While many focus on recent digital innovations, some of the most impactful retail technologies have been around for generations, revolutionizing how stores track inventory, process transactions, and understand customer behavior. This trivia question focuses on one such groundbreaking invention that fundamentally changed retail operations worldwide.

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Barcode scanner
Electronic cash register
Self-checkout kiosk
RFID tag system