Usage History of 'endotracheal'

The following chart shows how frequently 'endotracheal' appeared in printed materials over time. For example, the word 'endotracheal' occurred 8 times in books in 1843 and 24,180 times in 2008. From 1843 to 2008, the word 'endotracheal' was used a total of 727,978 times in books scanned by Google. See Reference: Google Ngram project.

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