000 00281nam a2200121Ia 4500
008 211209s1979 xx 000 0 und d
041 _aeng
082 _a621.382 N79 JAI
100 _aJAIN A K
245 _aPRINCIPLES OF TELEGRAPHY
260 _bNEW HEIGHTS
_c1979
300 _a244
999 _c19621
_d19621