Which technology first revolutionized retail point of sale systems in the 1970s, enabling the scanning of product information instead of manual entry?

Point of sale (POS) systems have evolved dramatically throughout retail history, transforming how merchants track sales and manage inventory. From manual cash registers to today's cloud-based solutions, these systems reflect the technological evolution of commerce. This trivia question explores a pivotal historical moment in retail technology that fundamentally changed how stores operated and set the foundation for modern retail analytics.

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Universal Product Code (UPC) barcode scanning
Radio-frequency identification (RFID) tags
Magnetic stripe card readers
Electronic cash registers with digital displays