Usage History of 'superheaters'

The following chart shows how frequently 'superheaters' appeared in printed materials over time. For example, the word 'superheaters' occurred 4 times in books in 1863 and 730 times in 2008. From 1863 to 2008, the word 'superheaters' was used a total of 47,241 times in books scanned by Google. See Reference: Google Ngram project.

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