railway RRB Technician Grade 3 Mock Test 2024 General Knowledge Science Technology and Inventions

खालीलपैकी कोणत्या शास्त्रज्ञाने बारकोडची रचना विकसित केली?

1
सेलमन वॅक्समन
2
जॉर्ज लॉरेर
3
जेम्स वॉटसन
4
जॉर्ज वाल्ड
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