Usage History of 'preheater'

The following chart shows how frequently 'preheater' appeared in printed materials over time. For example, the word 'preheater' occurred 4 times in books in 1600 and 1,568 times in 2008. From 1600 to 2008, the word 'preheater' was used a total of 90,931 times in books scanned by Google. See Reference: Google Ngram project.

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