General Knowledge · Inventions and Inventors
Who invented the thermionic valve (vacuum diode) used in early radio systems?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Nikola Tesla
- 2Lee de Forest
- 3Guglielmo Marconi
- 4Sir John Ambrose Fleming✓
Correct answer
Sir John Ambrose Fleming
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