The scanner reads the bar code label on something at a supermarket, and translates it into a number which the computer reads.
When were bar code scanners invented?
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Question context
This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.