Usage History of 'ketenes'

The following chart shows how frequently 'ketenes' appeared in printed materials over time. For example, the word 'ketenes' occurred 2 times in books in 1825 and 32 times in 2008. From 1825 to 2008, the word 'ketenes' was used a total of 6,937 times in books scanned by Google. See Reference: Google Ngram project.

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