Usage History of 'spirometers'

The following chart shows how frequently 'spirometers' appeared in printed materials over time. For example, the word 'spirometers' occurred 2 times in books in 1846 and 288 times in 2008. From 1846 to 2008, the word 'spirometers' was used a total of 16,743 times in books scanned by Google. See Reference: Google Ngram project.

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