000 002610000a22001210004500
080 _a621.372.5
_bT8
100 _aTurney, T.H.
245 _aElectric filters
260 _aLondon
_bPitman
_c1947
300 _ax, 170p.
650 _aELECTRIC FILTERS
942 _cBK
999 _c52691
_d52691