Usage History of 'pickproof'

The following chart shows how frequently 'pickproof' appeared in printed materials over time. For example, the word 'pickproof' occurred 4 times in books in 1931 and 15 times in 2008. From 1931 to 2008, the word 'pickproof' was used a total of 730 times in books scanned by Google. See Reference: Google Ngram project.

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