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  2. We reviewed and tested Phonak hearing aids - here's ... - AOL

    www.aol.com/lifestyle/phonak-hearing-aids...

    Phonak also offers pediatric hearing aids and solutions for individuals with single-sided deafness. Speak with a hearing professional to determine which models best suit your hearing needs, habits ...

  3. Sonova - Wikipedia

    en.wikipedia.org/wiki/Sonova

    Phonak Holding AG was founded in 1985 as a holding company for the Phonak Group. In 1987 corporate headquarters were moved from Zurich to Stäfa . The company was floated on the SWX Swiss Exchange in 1994 and renamed Sonova Holding AG on 1 August 2007, although this change applied only to the holding company and in parts to the subsidiaries ...

  4. Hearing aid - Wikipedia

    en.wikipedia.org/wiki/Hearing_aid

    The case is typically about the size of a pack of playing cards and is carried in a pocket or on a belt. [14] Without the size constraints of smaller hearing devices, body worn aid designs can provide large amplification and long battery life at a lower cost. Body aids are still used in emerging markets because of their relatively low cost. [14]

  5. List of largest domes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_domes

    The Florence Cathedral's dome has octagonal supporting walls, like the Dome of Soltaniyeh. The Dome of Soltaniyeh is the third largest brick dome in the world (after Florence Cathedral and Hagia Sophia). Hagia Sophia is older than the Dome of Soltaniyeh, but the Hagia Sophia is a single shell brick dome. [55] 1659 – 1937 44 140 Gol Gumbaz

  6. We tested Zepp Clarity hearing aids and here's everything we ...

    www.aol.com/lifestyle/zepp-clarity-hearing-aids...

    The over-the-ear design slides comfortably and securely onto your ear, with a thin tube (called the receiver wire) that rests against your head and a tulip-shaped dome that fits into your ear canal.

  7. History of hearing aids - Wikipedia

    en.wikipedia.org/wiki/History_of_hearing_aids

    The size of these transistors led to developments in miniature, carbon microphones. These microphones could be mounted on various items, even eyeglasses. [3] In 1951, Raytheon manufactured the transistor and was one of the first companies to mass-produce transistors to throughout America. Raytheon realized that their hearing aid only lasted ...

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