Usage History of 'headrests'

The following chart shows how frequently 'headrests' appeared in printed materials over time. For example, the word 'headrests' occurred 2 times in books in 1852 and 1,047 times in 2008. From 1852 to 2008, the word 'headrests' was used a total of 29,368 times in books scanned by Google. See Reference: Google Ngram project.

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