78255421
May 28, 2003
Aug 31, 2004
Active Trademark
electronic noise level monitoring apparatus; noise management systems comprising a microphone, electronic noise level sensing circuitry, indicator lights and an audible alarm for providing an audible and visual indication of the noise level in a room; traffic lights modified to serve as noise management devices by adding electronic noise level sensors and control circuitry for activating the lights in response to measured noise levels
Electrical and Scientific Apparatus