000 00284nam a2200121Ia 4500
008 220201s1964 xx 000 0 eng d
082 _a621.382
_bBIS
100 _aBiswas, N.N.
245 0 _aPrinciples of telegraphy
260 _aBombay
_bA.P.H.
_c1964
300 _a185
942 _2ddc
999 _c13725
_d13725