Frequency meters; Oscillographs; Power amplifiers; Power switches; Electronic products for the manipulation of the frequency, time, and amplitude characteristics of audio signals, namely, audio processors; Resistance measuring instruments; Sound level meters; Electronic products for the generation, measurement, and analysis of audio signals, namely, audio analyzers; Digital multimeters; Signal generators

'amplifi':5 'amplitud':18 'analysi':39 'analyz':45 'audio':21,24,41,44 'characterist':19 'digit':46 'electron':8,32 'frequenc':1,15 'generat':36,49 'instrument':28 'level':30 'manipul':12 'measur':27,37 'meter':2,31 'multimet':47 'name':23,43 'oscillograph':3 'power':4,6 'processor':25 'product':9,33 'resist':26 'signal':22,42,48 'sound':29 'switch':7 'time':16

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