Usage History of 'jackshafts'

The following chart shows how frequently 'jackshafts' appeared in printed materials over time. For example, the word 'jackshafts' occurred 4 times in books in 1890 and 18 times in 2008. From 1890 to 2008, the word 'jackshafts' was used a total of 691 times in books scanned by Google. See Reference: Google Ngram project.

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