cipie of Deflection of the Acousticon. NEW INSTRUMENTS FOR ENABLING THE DEAF T HEAR. Another Form of Acousticon. The Acousticon. A Portable Apparatus for the Deaf How the Acousticon is Carried Showing the Compactness of the Apparatus. The Massacon. A Photo-Electric Ear-Massaging Device. Listening to Music Transmitted by the Opera Box. Teaching a Deaf Mute How to Hear and Speak with the Instruction Outfit. The Desk Outfit. NEW INSTRUMENTS FOR ENABLING THE DEAF TO HEAR., scientific american, 1903-06-13
Keywords:
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