000 00292nam a2200121Ia 4500
008 220201s1981 xx 000 0 eng d
041 _aENG
100 _aDASS, P N
245 0 _aLINE TELEPHONY
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1981
300 _a198
942 _2ddc
999 _c51273
_d51273