000 00267nam a2200121Ia 4500
008 220201s1963 xx 000 0 eng d
082 _a621.382
100 _aMorgan, TJ
245 0 _aTelegraphy & telephony
260 _bLondon
_c1963
300 _a144
942 _2ddc
999 _c77585
_d77585