Usage History of 'interlock'

The following chart shows how frequently 'interlock' appeared in printed materials over time. For example, the word 'interlock' occurred 2 times in books in 1700 and 9,658 times in 2008. From 1700 to 2008, the word 'interlock' was used a total of 403,385 times in books scanned by Google. See Reference: Google Ngram project.

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