00310nam a2200109Ia 4500008004100000041000800041082002400049100004400073245003400117260004100151300000800192211209s1975    xx            000 0 und d  aeng  a621.384 187 N75 MIN  aMINISTRY OF POSTS OF TELECOMMUNICATIONS  aHAND BOOK OF RADIO OPERATORS   aNEW DELHIbS CHAND AND COMPANYc1975  a269