000 00295nam a2200121Ia 4500
008 220201s1969 xx 000 0 eng d
082 _bSIG
100 _aSignals, Royal
245 0 _aHandbook of line communication
260 _aDelhi
_bStandard Publishers
_c1969
300 _a905
942 _2ddc
999 _c16075
_d16075