The audiphone : a new invention that enables the deaf to hear through the medium of the teeth, and many of the deaf and dumb to hear and learn to speak : invented by Richard S. Rhodes : patented throughout the world : principal European office and Audiphone parlours, 225, Regent Street, London, W.

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The audiphone : a new invention that enables the deaf to hear through the medium of the teeth, and many of the deaf and dumb to hear and learn to speak : invented by Richard S. Rhodes : patented throughout the world : principal European office and Audiphone parlours, 225, Regent Street, London, W. Public Domain Mark. Source: Wellcome Collection.