Usage History of 'ignitrons'

The following chart shows how frequently 'ignitrons' appeared in printed materials over time. For example, the word 'ignitrons' occurred 8 times in books in 1928 and 2 times in 2008. From 1928 to 2008, the word 'ignitrons' was used a total of 15,149 times in books scanned by Google. See Reference: Google Ngram project.

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