Usage History of 'dustproof'

The following chart shows how frequently 'dustproof' appeared in printed materials over time. For example, the word 'dustproof' occurred 2 times in books in 1865 and 282 times in 2008. From 1865 to 2008, the word 'dustproof' was used a total of 15,337 times in books scanned by Google. See Reference: Google Ngram project.

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