Usage History of 'horsepowers'

The following chart shows how frequently 'horsepowers' appeared in printed materials over time. For example, the word 'horsepowers' occurred 2 times in books in 1813 and 160 times in 2008. From 1813 to 2008, the word 'horsepowers' was used a total of 10,512 times in books scanned by Google. See Reference: Google Ngram project.

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