When was bar code scanner invented________?
Correct answer: C. 1970s
- A. 1950s
- B. 1960s
- C. 1970s
- D. 1980s
Explanation
Although the barcode concept was patented earlier, the first practical retail barcode scanner system came into use in the 1970s, including the first UPC supermarket scan in 1974. That commercial milestone explains the decade given here.
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About Inventions and Discoveries
Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
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