Usage History of 'thiophen'

The following chart shows how frequently 'thiophen' appeared in printed materials over time. For example, the word 'thiophen' occurred 5 times in books in 1883 and 117 times in 2008. From 1883 to 2008, the word 'thiophen' was used a total of 7,567 times in books scanned by Google. See Reference: Google Ngram project.

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