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Mr. Dubey • 51.62K Points
Coach Physics

Q. पहले तापायनिक वाल्व का अविष्कार किसने किया था-

(A) थॉमस एडिसन ने
(B) रिचर्डसन ने
(C) जे०ए०फ्लेमिंग ने
(D) ली डी०फारेस्ट ने
Correct Answer - Option (C)

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