Usage History of 'sonars'

The following chart shows how frequently 'sonars' appeared in printed materials over time. For example, the word 'sonars' occurred 2 times in books in 1678 and 2,499 times in 2008. From 1678 to 2008, the word 'sonars' was used a total of 45,247 times in books scanned by Google. See Reference: Google Ngram project.

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