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Vacuum tube - Wikipedia
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File:Hp vacuum tube.jpg - Wikimedia Commons
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The 11 Greatest Vacuum Tubes You've Never Heard Of - IEEE Spectrum
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High potential testing of an YC-179 high power vacuum tube - LB3HC's engineering blog
Antique vacuum tubes and radio components at The Museum of Yesterday
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Vacuum Tubes | Nuts & Volts Magazine
It's a high power vacuum tube of some sort, possibly for an x-ray machine, given the context. : r/thisisthatthing
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