audio frequency and radio frequency signal generators, sine wave and square wave generators for laboratory and test usage, test oscillators, signal tracers, capacitor substitution boxes, resistor substitution boxes, variable D.C. power supplies for laboratory and test usage, field strength meters, vernier dials, transceiver test units, transistor test units, battery test units, capacitor test units, and electronic educational kits

'audio':1 'batteri':49 'box':25,28 'capacitor':23,52 'd.c':30 'dial':42 'educ':57 'electron':56 'field':38 'frequenc':2,5 'generat':7,13 'kit':58 'laboratori':15,34 'meter':40 'oscil':20 'power':31 'radio':4 'resistor':26 'signal':6,21 'sine':8 'squar':11 'strength':39 'substitut':24,27 'suppli':32 'test':17,19,36,44,47,50,53 'tracer':22 'transceiv':43 'transistor':46 'unit':45,48,51,54 'usag':18,37 'variabl':29 'vernier':41 'wave':9,12

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