Which invention, first patented in 1952 but not widely adopted in retail until the 1970s, revolutionized retail logistics by enabling automated inventory tracking?

The retail landscape has been shaped by groundbreaking inventions that transformed how we shop. From humble beginnings to technological marvels, these innovations revolutionized customer experience and business operations. This trivia question focuses on a pivotal invention that changed retail logistics forever, making products more accessible while dramatically improving inventory management. Test your knowledge about the technological milestones that built today's retail environment!

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The barcode (Universal Product Code)
The shopping cart (invented by Sylvan Goldman)
The cash register (patented by James Ritty)
The conveyor belt checkout system (developed by Clarence Saunders)