Transformers; Electromagnetic apparatus used to generate or measure magnetic fields; High voltage transformers; Magnetic and electromagnetic coils; Audio-frequency transformers; Current transformers; Distribution transformers; Electric coils; Electric transformers; Electric voltage transformers; Electrical conductors; Electrical transformers; Electromagnetic coils; Magnetic coils; Power transformers for amplification; Step down transformers; Step up transformers

'amplif':44 'apparatus':3 'audio':19 'audio-frequ':18 'coil':17,27,38,40 'conductor':34 'current':22 'distribut':24 'electr':26,28,30,33,35 'electromagnet':2,16,37 'field':10 'frequenc':20 'generat':6 'high':11 'magnet':9,14,39 'measur':8 'power':41 'step':45,48 'transform':1,13,21,23,25,29,32,36,42,47,50 'use':4 'voltag':12,31

(Based on 1(a) and 44(e)) Custom design of electromagnetic inductors; Custom design of electromagnetic transformers; Design of integrated circuits; (based on 1(a)) Custom engineering of electromagnetic inductors; custom engineering of electromagnetic transformers

'1':3,24 '44':6 'base':1,22 'circuit':21 'custom':8,13,26,31 'design':9,14,18 'e':7 'electromagnet':11,16,29,34 'engin':27,32 'inductor':12,30 'integr':20 'transform':17,35

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