Usage History of 'prolongers'

The following chart shows how frequently 'prolongers' appeared in printed materials over time. For example, the word 'prolongers' occurred 4 times in books in 1704 and 19 times in 2008. From 1704 to 2008, the word 'prolongers' was used a total of 1,121 times in books scanned by Google. See Reference: Google Ngram project.

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