Usage History of 'thermionics'

The following chart shows how frequently 'thermionics' appeared in printed materials over time. For example, the word 'thermionics' occurred 6 times in books in 1893 and 42 times in 2008. From 1893 to 2008, the word 'thermionics' was used a total of 6,365 times in books scanned by Google. See Reference: Google Ngram project.

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