Which groundbreaking retail technology innovation was first demonstrated at a grocery store in Ohio in 1974, revolutionizing inventory management and checkout efficiency?

The history of retail is filled with innovations that transformed the shopping experience. From manual cash registers to sophisticated point-of-sale systems, technological breakthroughs have revolutionized how products move from manufacturers to consumers. This trivia question focuses on a pivotal invention that fundamentally changed retail operations and created the foundation for modern inventory tracking and sales processing.

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The UPC barcode scanner
The electronic cash register (ECR)
The credit card point-of-sale terminal
The computerized inventory management system