Invention

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 * Barcodes were conceived as a kind of visual Morse code by a Philadelphia student in 1952, but retailers were slow to take up the technology which could be unreliable. **


 * This change in the early 1970s when the same student, Norman Woodland, then employed by IBM, devised the [11]  Product Code. Since then, black stripes have appeared on almost everything we buy, a ubiquity fuelled by their price it costs about a tenth of a penny to  [12]  on a barcode.**