00274nam a2200133Ia 4500020000900000082000800009100002700017245003500044250000600079260003500085300000800120500000600128650000600134  aNULL  a537  aHeckstall- Smith, H.w. 0aIntermediate Electrical Theory  a-  aLondonbJ. M. Dent & Sons Ltd.  a692  a0  a-