000 00247nam a2200097Ia 4500
008 220201s1978 xx 000 0 eng d
100 _aSIGNAL (ROYAL)
245 0 _aHANDBOOK OF LINE COMMUNICATION
260 _bSTANDARD PUB. DIST
_c1978
942 _2ddc
999 _c94237
_d94237