Usage History of 'ignitron'

The following chart shows how frequently 'ignitron' appeared in printed materials over time. For example, the word 'ignitron' occurred 2 times in books in 1920 and 22 times in 2008. From 1920 to 2008, the word 'ignitron' was used a total of 36,023 times in books scanned by Google. See Reference: Google Ngram project.

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