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Vacuum tube - Simple English Wikipedia, the free encyclopedia
Vacuum tube - Wikipedia
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Make a Mechanical Bug From a Vacuum Tube : 8 Steps (with Pictures) - Instructables
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1950s Vacuum Tube Computer Replica Communicates Through USB | Hackaday
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Vacuum tube - Wikipedia
File:Western Electric VT-1 Triode Vacuum Tube.jpg - Wikimedia Commons
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Vacuum Tubes (Valves)
Vacuum Tubes: The World Before Transistors | Engineering.com
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