Usage History of 'parfocal'

The following chart shows how frequently 'parfocal' appeared in printed materials over time. For example, the word 'parfocal' occurred 2 times in books in 1887 and 176 times in 2008. From 1887 to 2008, the word 'parfocal' was used a total of 7,348 times in books scanned by Google. See Reference: Google Ngram project.

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