1930, in the meaning defined above
Time Traveler for phototube
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Cite this Entry
“Phototube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phototube. Accessed 18 Jan. 2022.
More from Merriam-Webster on phototube
Britannica.com: Encyclopedia article about phototube
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