Usage History of 'negatrons'

The following chart shows how frequently 'negatrons' appeared in printed materials over time. For example, the word 'negatrons' occurred 2 times in books in 1888 and 128 times in 2008. From 1888 to 2008, the word 'negatrons' was used a total of 6,213 times in books scanned by Google. See Reference: Google Ngram project.

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