Semi-conductors; wafers for integrated circuits; silicon epitaxial wafer; amplifiers; piezoelectric sensors; light-emitting diodes (LED); triodes; electricity inverters; semi-conductor devices; step-up transformers

'amplifi':11 'circuit':7 'conductor':3,24 'devic':25 'diod':17 'electr':20 'emit':16 'epitaxi':9 'integr':6 'invert':21 'led':18 'light':15 'light-emit':14 'piezoelectr':12 'semi':2,23 'semi-conductor':1,22 'sensor':13 'silicon':8 'step':27 'step-up':26 'transform':29 'triod':19 'wafer':4,10

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