Apparatus and instruments for measuring and checking sound waves, sound and audio signals, namely, digital signal processors, sound and/or audio equalizers, analyzers and processors, surround sound systems, sound level meters, sound mixers, electronic frequency converters for sound velocity, sound and/or audio amplifiers, cables and fibers to check sound and/or audio; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, namely...

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