Spark gap
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What links here
Neon lamp
Negative resistance
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Radioactive decay
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Relaxation oscillator
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Carl Auer von Welsbach
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Lighting
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Plasma display
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Cold cathode
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Photoresistor
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Metronome
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List of inventors
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Nixie tube
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Moscow Metro
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1900s
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Neon
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Light
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Kirlian photography
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Electronic oscillator
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Dance Dance Revolution
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Cathode
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