Usage History of 'sonar'

The following chart shows how frequently 'sonar' appeared in printed materials over time. For example, the word 'sonar' occurred 3 times in books in 1631 and 29,824 times in 2008. From 1631 to 2008, the word 'sonar' was used a total of 836,157 times in books scanned by Google. See Reference: Google Ngram project.

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