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Non-Commercial Use
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Category
Electronic Components
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On Display
Science Museum
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Making the Modern World Gallery
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Object type
diode valves
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electronic valves
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thermionic emission
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thermionic emission; diode valves; electronic valves
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Maker
Fleming, Sir John Ambrose; Edison & Swan United Electric Light Company
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John Ambrose Fleming
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Place of origin
London
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London, Greater London, England, United Kingdom
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One of Fleming's first thermionic diode valves, 1889
1889
