Which of these retail innovations was first invented by Norman Joseph Woodland and Bernard Silver in 1951, but wasn't widely adopted in stores until the 1970s?

The history of retail is filled with groundbreaking innovations that forever changed how consumers shop. From humble beginnings to technological revolutions, certain inventions have transformed the retail landscape in ways their creators could never have imagined. This trivia question focuses on a pivotal invention that revolutionized product tracking and inventory management, leading to faster checkouts and better data collection for retailers worldwide.

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Self-checkout kiosks
Barcode scanner/UPC system
Electronic anti-theft tags
Digital price display tags