Usage History of 'polygraphs'

The following chart shows how frequently 'polygraphs' appeared in printed materials over time. For example, the word 'polygraphs' occurred 2 times in books in 1708 and 1,602 times in 2008. From 1708 to 2008, the word 'polygraphs' was used a total of 34,432 times in books scanned by Google. See Reference: Google Ngram project.

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