Usage History of 'tetrode'

The following chart shows how frequently 'tetrode' appeared in printed materials over time. For example, the word 'tetrode' occurred 2 times in books in 1712 and 634 times in 2008. From 1712 to 2008, the word 'tetrode' was used a total of 84,322 times in books scanned by Google. See Reference: Google Ngram project.

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