Usage History of 'pingers'

The following chart shows how frequently 'pingers' appeared in printed materials over time. For example, the word 'pingers' occurred 2 times in books in 1739 and 104 times in 2008. From 1739 to 2008, the word 'pingers' was used a total of 5,032 times in books scanned by Google. See Reference: Google Ngram project.

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