Important Inventions and Discoveries in World » Exercise – 1
73. When were bar code scanners invented?
(a) 1940s
(b) 1950s
(c) 1970s
(d) 1960s
| Subject Name : General Knowledge |
| Exam Name : UPSC, SSC, KVS, NVS, IBPS, RBI, SBI, RRB |
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