Usage History of 'audiphones'

The following chart shows how frequently 'audiphones' appeared in printed materials over time. For example, the word 'audiphones' occurred 2 times in books in 1879 and 24 times in 2008. From 1879 to 2008, the word 'audiphones' was used a total of 668 times in books scanned by Google. See Reference: Google Ngram project.

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