Usage History of 'impeller'

The following chart shows how frequently 'impeller' appeared in printed materials over time. For example, the word 'impeller' occurred 2 times in books in 1698 and 17,739 times in 2008. From 1698 to 2008, the word 'impeller' was used a total of 672,373 times in books scanned by Google. See Reference: Google Ngram project.

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