Usage History of 'helmets'

The following chart shows how frequently 'helmets' appeared in printed materials over time. For example, the word 'helmets' occurred 8 times in books in 1590 and 68,368 times in 2008. From 1590 to 2008, the word 'helmets' was used a total of 1,390,448 times in books scanned by Google. See Reference: Google Ngram project.

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