General Science · Inventions and Discoveries
पहले लेसर का निर्माण करने वाले थियोडोर मैमन किस देश के नागरिक थे?
- 1जर्मनी
- 2यू.एस.ए.✓
- 3यूनाइटेड किंगडम
- 4कनाडा
सही उत्तर देखें
यू.एस.ए.
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