00281nam a2200109Ia 4500008004100000041000800041082002000049100001500069245003000084260004900114300000800163211209s1980    xx            000 0 und d  aeng  a621.383 N80 BIS  aBISWAS M N  aPRINCIPLES OF TELEGRAPHY   aBOMBAYbMEDIA PROMOTERS AND PUBLISHERSc1980  a195