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Black and white image of various models of Vacuum Tubes which are... News Photo - Getty Images
8127 MULTI-POLES MERCURY VAPOR VACUUM TUBE
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Tube General Electric 83 Mercury Vacuum Tube Guaranteed Tested (48b6) | eBay
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Vintage Amperex 575A Mercury Vapor Rectifier Vacuum Tube | eBay
Vacuum tube with mercury, a sample of the element Mercury in the Periodic Table
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Announcing the 'Mercury' Vacuum Tube Fuzz - Effectrode
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