00307nam a2200097Ia 4500008004100000082001700041100001900058245007600077260003800153700001800191220204s9999    xx            000 0 und d  a621.314bSTI  aFranklin,  A C 0aJ & P transformer book: A practical technology of the power transformer  aLondonbNewnes-Butterworthsc1973  aStignant, S A