Usage History of 'rotor'

The following chart shows how frequently 'rotor' appeared in printed materials over time. For example, the word 'rotor' occurred 2 times in books in 1687 and 115,092 times in 2008. From 1687 to 2008, the word 'rotor' was used a total of 3,771,491 times in books scanned by Google. See Reference: Google Ngram project.

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