Which invention, first patented in 1952, is considered the foundation of modern retail personalization technology by enabling retailers to systematically track customer purchases?

The retail landscape has been transformed by technological innovations that enable personalized shopping experiences. Before algorithms and big data became commonplace, certain pioneering technologies laid the groundwork for what we now know as retail personalization. This trivia question explores a key invention that revolutionized how retailers track customer preferences and purchasing patterns, fundamentally changing the relationship between stores and shoppers.

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• The barcode scanner, invented by Norman Joseph Woodland and Bernard Silver
• The magnetic stripe card, developed by IBM engineer Forrest Parry
• The electronic point-of-sale system, created by IBM for McDonald's
• The store loyalty card, pioneered by Sperry & Hutchinson's Green Stamps program

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