Usage History of 'rehardened'

The following chart shows how frequently 'rehardened' appeared in printed materials over time. For example, the word 'rehardened' occurred 2 times in books in 1822 and 112 times in 2008. From 1822 to 2008, the word 'rehardened' was used a total of 3,226 times in books scanned by Google. See Reference: Google Ngram project.

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