000 00276nam a2200121Ia 4500
008 220201s1958 xx 000 0 eng d
082 _a684
_bREN
100 _aRenton, R.N.
245 0 _aTelecommunication principles
260 _bPitman
_c1958
300 _a446
942 _2ddc
999 _c14910
_d14910