Usage History of 'earphones'

The following chart shows how frequently 'earphones' appeared in printed materials over time. For example, the word 'earphones' occurred 4 times in books in 1870 and 11,007 times in 2008. From 1870 to 2008, the word 'earphones' was used a total of 313,089 times in books scanned by Google. See Reference: Google Ngram project.

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