In what year was the world's first self-checkout system invented and patented, long before it became mainstream in retail stores?

The retail landscape has been transformed by numerous technological innovations aimed at improving customer experience and operational efficiency. One of the most significant advancements that changed how consumers interact with retail stores is the self-checkout system. This invention revolutionized traditional checkout processes by empowering customers to scan, bag, and pay for their purchases independently. Test your knowledge about this retail innovation that has become ubiquitous in modern shopping environments.

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1984, by computer scientist John H. Murphy at Florida State University
1992, by Howard Schneider, who installed the first working system at a Price Chopper supermarket
1973, by IBM engineers as part of their early point-of-sale systems development
2001, by Amazon as an early prototype for their later Amazon Go stores