In which year was the world's first self-checkout system patented, long before its widespread adoption in retail stores?

Self-checkout technology revolutionized retail operations by allowing customers to scan, bag, and pay for items without cashier assistance. This innovation changed store layouts, customer flow patterns, and staffing models across the retail industry. While now ubiquitous in modern stores, the journey from invention to widespread adoption reveals fascinating insights about retail innovation and consumer behavior adaptation. Test your knowledge about this retail technology milestone!

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1984 - By CompuScan's 'CheckRobot' system
1992 - By Dr. Howard Schneider's 'Service Robot'
1939 - By Clarence Saunders' 'Keedoozle' automated store concept
1977 - By IBM's 'Checkout Counter' experimental system