Usage History of 'urethanes'

The following chart shows how frequently 'urethanes' appeared in printed materials over time. For example, the word 'urethanes' occurred 4 times in books in 1878 and 951 times in 2008. From 1878 to 2008, the word 'urethanes' was used a total of 45,941 times in books scanned by Google. See Reference: Google Ngram project.

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