Usage History of 'pilferproof'

The following chart shows how frequently 'pilferproof' appeared in printed materials over time. For example, the word 'pilferproof' occurred 2 times in books in 1920 and 11 times in 2008. From 1920 to 2008, the word 'pilferproof' was used a total of 456 times in books scanned by Google. See Reference: Google Ngram project.

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