000 00318nam a2200121Ia 4500
008 220201s1978 xx 000 0 eng d
082 _a621.3815
_bSIG
100 _aSignals,Royal
245 0 _aHandbook of line communication
260 _aDelhi
_bStandard Publisher & Distributers
_c1978
300 _a904
942 _2ddc
999 _c32785
_d32785