Usage History of 'valve'

The following chart shows how frequently 'valve' appeared in printed materials over time. For example, the word 'valve' occurred 2 times in books in 1589 and 514,365 times in 2008. From 1589 to 2008, the word 'valve' was used a total of 17,539,110 times in books scanned by Google. See Reference: Google Ngram project.

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