000 00257nam a2200097Ia 4500
008 220201s9999 xx 000 0 eng d
100 _aSIGNAL (ROYAL)
245 0 _aHAND BOOK OF LINE COMMUNICATIONS
260 _bSTANDARD PUB. & DIST NEW DELHI
942 _2ddc
999 _c100399
_d100399