Usage History of 'triplex'

The following chart shows how frequently 'triplex' appeared in printed materials over time. For example, the word 'triplex' occurred 1 time in books in 1678 and 4,245 times in 2008. From 1678 to 2008, the word 'triplex' was used a total of 159,615 times in books scanned by Google. See Reference: Google Ngram project.

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