Usage History of 'pulmotors'

The following chart shows how frequently 'pulmotors' appeared in printed materials over time. For example, the word 'pulmotors' occurred 10 times in books in 1912 and 8 times in 2008. From 1912 to 2008, the word 'pulmotors' was used a total of 1,146 times in books scanned by Google. See Reference: Google Ngram project.

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