Usage History of 'perforating'

The following chart shows how frequently 'perforating' appeared in printed materials over time. For example, the word 'perforating' occurred 2 times in books in 1651 and 11,128 times in 2008. From 1651 to 2008, the word 'perforating' was used a total of 478,207 times in books scanned by Google. See Reference: Google Ngram project.

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