000 00311nam a2200121Ia 4500
008 220201s1978 xx 000 0 eng d
041 _aENG
100 _aSIGNAL,ROYAL
245 0 _aHANDBOOK OF LINE COMMUNICATION
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1978
300 _a904
942 _2ddc
999 _c61654
_d61654