Usage History of 'airproof'

The following chart shows how frequently 'airproof' appeared in printed materials over time. For example, the word 'airproof' occurred 4 times in books in 1758 and 86 times in 2008. From 1758 to 2008, the word 'airproof' was used a total of 2,371 times in books scanned by Google. See Reference: Google Ngram project.

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