000 00277nam a2200121Ia 4500
008 230222s9999 xx 000 0 und d
082 _a621.38412
100 _aJack R Smith
245 0 _aModern communication circuits
250 _a2
260 _bMcgrawhill
_c2003
942 _cBK
999 _c3190
_d3190