Usage History of 'keyholes'

The following chart shows how frequently 'keyholes' appeared in printed materials over time. For example, the word 'keyholes' occurred 2 times in books in 1715 and 2,972 times in 2008. From 1715 to 2008, the word 'keyholes' was used a total of 53,600 times in books scanned by Google. See Reference: Google Ngram project.

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