In 1935, Ralph Allison founded the Audio Development Company in the basement of his south Minneapolis home, inventing ADC's first product, the audiometer, an electronic device designed to test hearing.
22.
"In 1979, Starkey developed the CHAT hearing aid tester, the Tinnitus Research Audiometer and the Digital Drain Meter state-of-the-art diagnostic equipment that helped to improve patient service.
23.
However, she collaborated with the Post Office more extensively when she tested the hearing of telephonists using her audiometer, and in 1937 she installed Post Office amplified telephones designed for people with hearing loss into her clinic.
24.
In 1899, Carl E . Seashore Prof . of Psychology at U . Iowa, United States, introduced the audiometer as an instrument to measure the keenness of hearing whether in the laboratory, schoolroom, or office of the psychologist or aurist.
25.
Bell's inventions spanned a wide range of interests and included a metal jacket to assist in breathing, the audiometer to detect minor hearing problems, a device to locate icebergs, investigations on how to separate salt from seawater, and work on finding alternative fuels.
26.
His fingers contain a different variety of devices, including : gas chromatograph, laser interferometer, micro-pulse radar, audiometer, seismometer, gravity wave detector, pulse-code modulator, standard computer input / outputs, radio beacon, all-wave transceiver, laser cutting torch / weapon, and projecting heat, cold, or electricity; one of his fingers has been shown to contain a bullet-firing mechanism that uses . 357 Magnum ammunition.
