Usage History of 'ramjet'

The following chart shows how frequently 'ramjet' appeared in printed materials over time. For example, the word 'ramjet' occurred 2 times in books in 1685 and 1,748 times in 2008. From 1685 to 2008, the word 'ramjet' was used a total of 68,401 times in books scanned by Google. See Reference: Google Ngram project.

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