Definition of electron tube
: an electronic device in which conduction by electrons takes place through a vacuum or a gaseous medium within a sealed glass or metal container and which has various uses based on the controlled flow of electrons
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“Electron tube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/electron%20tube. Accessed 21 Jun. 2021.
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Time Traveler for electron tube
The first known use of electron tube was in 1919
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