Usage History of 'jackknives'

The following chart shows how frequently 'jackknives' appeared in printed materials over time. For example, the word 'jackknives' occurred 8 times in books in 1764 and 494 times in 2008. From 1764 to 2008, the word 'jackknives' was used a total of 10,806 times in books scanned by Google. See Reference: Google Ngram project.

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