74439932
Sep 24, 1993
Jan 31, 1995
audio modules consisting of amplifiers, preamplifiers, signal generators, power supplies and regulators, filters, switches, automatic levelers and limiters, oscillators and tone controls; audio transformers; impedence matching interfaces and telephone interfaces; audio mixers; audio and microphone splitters and combiners; signal processors; audio test equipment, namely audio generators, cable testers, noise and tone burst generators and sound level meters
Electrical and Scientific Apparatus