2013-10-152013-10-151879http://hdl.handle.net/10713/3452Includes various endorsements and testimonials certifying the effectiveness of the Dentaphoneen-USAudiology--InstrumentsSpeech therapy--InstrumentsAmerican Dentaphone CompanySupplement to pamphlet descriptive of the DentaphoneSubtitle: New scientific invention, which enables the deaf to hear through the medium of the teeth, and the deaf and dumb to hear and learn to speakBrochure/Program