Frequency inverter; Electric converters; Electric switches; Electricity inverters; Electrical power supplies; Rheostats; Solar batteries; Power factor regulator to economize the delivery of electrical power; Dynamometers; Power amplifier; Power converter; Electronic apparatus for testing electrical equipment, namely, a spectrum analyzer; Radio frequency spectrum analyzer

'amplifi':27 'analyz':39,43 'apparatus':31 'batteri':14 'convert':4,29 'deliveri':21 'dynamomet':25 'econom':19 'electr':3,5,7,9,23,34 'electron':30 'equip':35 'factor':16 'frequenc':1,41 'invert':2,8 'name':36 'power':10,15,24,26,28 'radio':40 'regul':17 'rheostat':12 'solar':13 'spectrum':38,42 'suppli':11 'switch':6 'test':33

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