Usage History of 'perforators'

The following chart shows how frequently 'perforators' appeared in printed materials over time. For example, the word 'perforators' occurred 2 times in books in 1696 and 3,928 times in 2008. From 1696 to 2008, the word 'perforators' was used a total of 84,927 times in books scanned by Google. See Reference: Google Ngram project.

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