Usage History of 'invalidators'

The following chart shows how frequently 'invalidators' appeared in printed materials over time. For example, the word 'invalidators' occurred 6 times in books in 1823 and 14 times in 2007. From 1823 to 2007, the word 'invalidators' was used a total of 606 times in books scanned by Google. See Reference: Google Ngram project.

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