Which retail technology invention, patented in 1952, revolutionized supply chain management by automating inventory tracking and is considered a precursor to modern e-commerce systems?

The retail industry has witnessed numerous technological advancements that have revolutionized how products are developed, marketed, and sold. One particular innovation dramatically changed the way retailers track inventory and process sales. This invention, initially met with skepticism by traditional retailers, is now considered one of the most significant retail technology breakthroughs in modern history. Test your knowledge about this game-changing retail innovation!

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The barcode (Universal Product Code)
The electronic cash register
Radio-frequency identification (RFID) tags
Electronic shelf labels (ESL)