Usage History of 'refractories'

The following chart shows how frequently 'refractories' appeared in printed materials over time. For example, the word 'refractories' occurred 2 times in books in 1693 and 2,748 times in 2008. From 1693 to 2008, the word 'refractories' was used a total of 301,358 times in books scanned by Google. See Reference: Google Ngram project.

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