Usage History of 'valveless'

The following chart shows how frequently 'valveless' appeared in printed materials over time. For example, the word 'valveless' occurred 2 times in books in 1797 and 809 times in 2008. From 1797 to 2008, the word 'valveless' was used a total of 26,730 times in books scanned by Google. See Reference: Google Ngram project.

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