Physics · Electronics
Who invented the triode valve, and in which year?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Walter Brattain, 1947
- 2John Ambrose Fleming, 1904
- 3Lee de Forest, 1907✓
- 4Thomas Edison, 1879
Correct answer
Lee de Forest, 1907
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