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selbsttaetige electrical speed - or frequency control device, preferably for the regulation of the trimmer - or converters, which on one of a furnace coil of an electric induction - furnace and a compensation capacitor composite resonant circuit operate
selbsttaetige electrical speed - or frequency control device, preferably for the regulation of the trimmer - or converters, which on one of a furnace coil of an electric induction - furnace and a compensation capacitor composite resonant circuit operate