Important Inventions and Discoveries in World – 73

Important Inventions and Discoveries in World » Exercise – 1

73. When were bar code scanners invented?

(a) 1940s
(b) 1950s
(c) 1970s
(d) 1960s

Answer
Answer : (c)
Explanation
Explanation : The scanner reads the bar code label on something at a supermarket, and translates it into a number which the computer reads.
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