Physics · Modern Physics
तापायनिक वाल्व (डायोड बल्ब) का आविष्कार किसने किया था?
- 1जे० जे० थॉमसन
- 2थॉमस एडिसन
- 3ली डी फॉरेस्ट
- 4जे० ए० फ्लेमिंग✓
सही उत्तर देखें
जे० ए० फ्लेमिंग
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