Usage History of 'impingements'

The following chart shows how frequently 'impingements' appeared in printed materials over time. For example, the word 'impingements' occurred 4 times in books in 1825 and 774 times in 2008. From 1825 to 2008, the word 'impingements' was used a total of 28,098 times in books scanned by Google. See Reference: Google Ngram project.

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