Usage History of 'unfolders'

The following chart shows how frequently 'unfolders' appeared in printed materials over time. For example, the word 'unfolders' occurred 2 times in books in 1775 and 32 times in 2008. From 1775 to 2008, the word 'unfolders' was used a total of 313 times in books scanned by Google. See Reference: Google Ngram project.

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