Usage History of 'preheating'

The following chart shows how frequently 'preheating' appeared in printed materials over time. For example, the word 'preheating' occurred 2 times in books in 1706 and 5,154 times in 2008. From 1706 to 2008, the word 'preheating' was used a total of 242,400 times in books scanned by Google. See Reference: Google Ngram project.

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