Usage History of 'valves'

The following chart shows how frequently 'valves' appeared in printed materials over time. For example, the word 'valves' occurred 4 times in books in 1666 and 183,359 times in 2008. From 1666 to 2008, the word 'valves' was used a total of 7,007,964 times in books scanned by Google. See Reference: Google Ngram project.

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