Usage History of 'padlock'

The following chart shows how frequently 'padlock' appeared in printed materials over time. For example, the word 'padlock' occurred 4 times in books in 1673 and 20,270 times in 2008. From 1673 to 2008, the word 'padlock' was used a total of 344,817 times in books scanned by Google. See Reference: Google Ngram project.

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