Barcode
A barcode is a machine-readable method of representing data with lines, spaces, or grid patterns. It is used for product identification as well as logistics and inventory management.
The first retail barcode scan was not on a fancy gadget, but on Wrigley's chewing gum. On June 26, 1974, at a Marsh supermarket in Troy, Ohio, a pack of gum became the first UPC purchase scanned at checkout.
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