Vacuum tube - Wikipedia
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866A - Wikipedia
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Vacuum tube with mercury, a sample of the element Mercury in the Periodic Table
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Mercury-arc valve - Wikipedia
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Mercury barometer vector illustration. Labeled atmospheric pressure tool. Earth surface weather measurement instrument with glass tube and vacuum Stock Vector Image & Art - Alamy
Some sort of vacuum tube with mercury and water in it? Came out of an old potentiometer : r/whatisthisthing
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Vacuum tube - Wikipedia
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8127 MULTI-POLES MERCURY VAPOR VACUUM TUBE
Mercury vapor rectifier tube - YouTube
