Usage History of 'cardiogram'

The following chart shows how frequently 'cardiogram' appeared in printed materials over time. For example, the word 'cardiogram' occurred 2 times in books in 1809 and 698 times in 2008. From 1809 to 2008, the word 'cardiogram' was used a total of 41,005 times in books scanned by Google. See Reference: Google Ngram project.

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