Usage History of 'refresher'

The following chart shows how frequently 'refresher' appeared in printed materials over time. For example, the word 'refresher' occurred 2 times in books in 1642 and 13,641 times in 2008. From 1642 to 2008, the word 'refresher' was used a total of 400,571 times in books scanned by Google. See Reference: Google Ngram project.

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