00289nam a2200109Ia 4500008004100000020001400041041000800055100001300063245003700076260005300113300001300166211209s1970    xx            000 0 und d  a592059766  aeng  aBALL,A M  aRADIO VALVE AND TRANSISTOR DATA   aLONDONbBUTTERWART AND CO. PUBLISHERS LTD.c1970  aII + 232