00289nam a2200109Ia 450000500170000000800410001708200150005810000150007324500400008826000430012830000080017120260225050935.0260224s9999||||xx |||||||||||||| ||und||  a621.39 COT  aH. Cotton  0aPrnciples of electrical technology   aLondon: ISAAC Pitman & Sons Ltd c1966  a658