Usage History of 'switchboards'

The following chart shows how frequently 'switchboards' appeared in printed materials over time. For example, the word 'switchboards' occurred 2 times in books in 1821 and 3,308 times in 2008. From 1821 to 2008, the word 'switchboards' was used a total of 161,982 times in books scanned by Google. See Reference: Google Ngram project.

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