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You are right, another article touches on this topic: https://en.wikipedia.org/wiki/Vacuum_tube#Vacuum https://en.wikipedia.org/wiki/Vacuum_tube#Vacuum
by rzzzt 10y ago
You are right, another article touches on this topic: https://en.wikipedia.org/wiki/Vacuum_tube#Vacuum https://en.wikipedia.org/wiki/Vacuum_tube#Vacuum