Which revolutionary retail technology, invented in 1952, first allowed products to be automatically identified at checkout without manual price entry?

The world of retail has been transformed by numerous technological inventions that changed how products are marketed and sold. Before online shopping and digital displays became commonplace, several groundbreaking innovations revolutionized how customers interact with products in stores. Test your knowledge about a pivotal invention that fundamentally changed retail marketing and customer experience forever!

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The UPC barcode system
The magnetic stripe card reader
The electronic cash register (ECR)
RFID product tags