Usage History of 'impregnators'

The following chart shows how frequently 'impregnators' appeared in printed materials over time. For example, the word 'impregnators' occurred 4 times in books in 1838 and 58 times in 2008. From 1838 to 2008, the word 'impregnators' was used a total of 2,102 times in books scanned by Google. See Reference: Google Ngram project.

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