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  2. Walker Electric Truck - Wikipedia

    en.wikipedia.org/wiki/Walker_Electric_Truck

    Walker Electric Trucks were battery-powered vehicles built from 1907 to 1942 in Chicago, Illinois and Detroit, Michigan. Initially designed and manufactured by the Walker Vehicle Company (not to be confused with the Walker Motor Car Company ) in Chicago, they were bought by the Anderson Electric Car Company of Detroit in 1916, then sold to ...

  3. Zinc–air battery - Wikipedia

    en.wikipedia.org/wiki/Zinc–air_battery

    Zinc–air batteries have higher energy density than many other types of battery because atmospheric air is one of the battery reactants, in contrast to battery types that require a material such as manganese dioxide in combination with zinc. Energy density, when measured by weight (mass) is known as specific energy. The following table shows ...

  4. Hearing aid - Wikipedia

    en.wikipedia.org/wiki/Hearing_aid

    A modern behind the ear hearing aid with a minicell battery. Behind the ear hearing aids are one of two major classes of hearing aids – behind the ear (BTE) and in the ear (ITE). These two classes are distinguished by where the hearing aid is worn. BTE hearing aids consist of a case which hangs behind the pinna. The case is attached to an ...

  5. History of hearing aids - Wikipedia

    en.wikipedia.org/wiki/History_of_hearing_aids

    Transistors were created to replace vacuum tubes; they were small, required less battery power and had less distortion and heat than their predecessor. [3] These vacuum tubes were typically hot and fragile, so the transistor was the ideal replacement. [6] The 1952 Sonotone 1010 used a transistor stage along with vacuum tubes, to extend battery ...

  6. Audio induction loop - Wikipedia

    en.wikipedia.org/wiki/Audio_induction_loop

    A hearing loop consists of one or more physical loops of cable which are placed around a designated area, usually a room or a building. The cable generates an electromagnetic field throughout the looped space which can be picked up by a telecoil-equipped hearing aid, a cochlear implant (CI) processor, or a specialized hand-held hearing loop receiver for individuals without telecoil-compatible ...

  7. Ear trumpet - Wikipedia

    en.wikipedia.org/wiki/Ear_trumpet

    An 18th-century drawing of ear trumpets. An ear trumpet is a tubular or funnel-shaped device which collects sound waves and leads them into the ear.They are used as hearing aids, resulting in a strengthening of the sound energy impact to the eardrum and thus improved hearing for a deaf or hard-of-hearing individual.

  8. Middle ear implant - Wikipedia

    en.wikipedia.org/wiki/Middle_ear_implant

    A middle ear implant is a hearing device that is surgically implanted into the middle ear. They help people with conductive, sensorineural or mixed hearing loss to hear. [1] Middle ear implants work by improving the conduction of sound vibrations from the middle ear to the inner ear. There are two types of middle ear devices: active and passive.

  9. Adaptive feedback cancellation - Wikipedia

    en.wikipedia.org/wiki/Adaptive_feedback_cancellation

    Adaptive feedback cancellation originated during the evolution of the hearing aid. The hearing aid became digital, and as such feedback cancellation was needed. In 1980 a directional microphone was introduced in the digital hearing aid, and adaptive feedback cancellation was created to block external noise that the microphone picked up. Today ...