Usage History of 'impactor'

The following chart shows how frequently 'impactor' appeared in printed materials over time. For example, the word 'impactor' occurred 2 times in books in 1904 and 3,866 times in 2008. From 1904 to 2008, the word 'impactor' was used a total of 100,253 times in books scanned by Google. See Reference: Google Ngram project.

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