000 00311nam a2200121Ia 4500
008 220201s1974 xx 000 0 eng d
082 _bSIG
100 _aSignals Royal
245 0 _aHandbook of Line communication
260 _aNew Delhi
_bStandard Publishers Distributors
_c1974
300 _a905
942 _2ddc
999 _c17205
_d17205