000 00236nam a22001217a 4500
003 LIB
082 _a621.382
100 _aEDITION THIRD
245 _aSIGNALS AND SYSTEM
260 _bOXFORD
_c2009
300 _a424
942 _2ddc
_cBTECH
999 _c23646
_d23646