76347776
Dec 13, 2001
Jun 22, 2004
CONTINUOUS NOISE EXPOSURE MONITORING SYSTEM, NAMELY, A PERSONAL NOISE DOSIMETER COMPRISING A MICROPHONE, TRANSMITTER AND MICROPROCESSOR CHIP INTEGRATED WITH HEARING PROTECTION DEVICES, NAMELY EAR MUFFS AND EAR PLUGS TO MEASURE INDIVIDUAL NOISE EXPOSURE
Electrical and Scientific Apparatus