Usage History of 'couchette'

The following chart shows how frequently 'couchette' appeared in printed materials over time. For example, the word 'couchette' occurred 2 times in books in 1751 and 345 times in 2008. From 1751 to 2008, the word 'couchette' was used a total of 11,776 times in books scanned by Google. See Reference: Google Ngram project.

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