Usage History of 'precooling'

The following chart shows how frequently 'precooling' appeared in printed materials over time. For example, the word 'precooling' occurred 8 times in books in 1906 and 1,212 times in 2008. From 1906 to 2008, the word 'precooling' was used a total of 45,038 times in books scanned by Google. See Reference: Google Ngram project.

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