Usage History of 'tubes'

The following chart shows how frequently 'tubes' appeared in printed materials over time. For example, the word 'tubes' occurred 2 times in books in 1645 and 348,275 times in 2008. From 1645 to 2008, the word 'tubes' was used a total of 14,639,745 times in books scanned by Google. See Reference: Google Ngram project.

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