Usage History of 'coupler'

The following chart shows how frequently 'coupler' appeared in printed materials over time. For example, the word 'coupler' occurred 22 times in books in 1698 and 16,445 times in 2008. From 1698 to 2008, the word 'coupler' was used a total of 598,406 times in books scanned by Google. See Reference: Google Ngram project.

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