Physics · Famous Inventions
एक्स-रे (X-rays) की खोज/आविष्कार किसने किया था?
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- 1हेनरिक डैम
- 2सर जे.ए. फ्लेमिंग
- 3विल्हेम कॉनराड रॉटजन✓
- 4चेस्टर कार्लसन
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