Usage History of 'counterflow'

The following chart shows how frequently 'counterflow' appeared in printed materials over time. For example, the word 'counterflow' occurred 2 times in books in 1718 and 1,883 times in 2008. From 1718 to 2008, the word 'counterflow' was used a total of 107,423 times in books scanned by Google. See Reference: Google Ngram project.

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