85949530
Jun 3, 2013
Oct 29, 2013
Technological devices for improving acoustic clarity and audio transmission and reception for assisting persons with sensory or cognitive impairments and to preserve hearing levels sold as an integral component of headphone wires; cellular telephone and voice over internet protocol telephone headset unit wires featuring technological devices for improving acoustic clarity and audio transmission and reception for assisting persons with sensory or cognitive impairments and to preserve hearing levels
Electrical and Scientific Apparatus