Usage History of 'triode'

The following chart shows how frequently 'triode' appeared in printed materials over time. For example, the word 'triode' occurred 2 times in books in 1768 and 2,220 times in 2008. From 1768 to 2008, the word 'triode' was used a total of 426,080 times in books scanned by Google. See Reference: Google Ngram project.

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