Usage History of 'knockless'

The following chart shows how frequently 'knockless' appeared in printed materials over time. For example, the word 'knockless' occurred 1 time in books in 1918 and 2 times in 2007. From 1918 to 2007, the word 'knockless' was used a total of 251 times in books scanned by Google. See Reference: Google Ngram project.

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