000 00427cam a2200157ua 4500
041 _aeng
_h
082 _a621.3192
_bWIL/EL
100 _aWilliams, Enrys .
245 _aElectric filter circuits: An introductory course /
_cEmrys Williams.
_hTextual Documents
250 _a1 /
_b.
260 _aLondon :
_bSir Isaac Pitman & Sons Ltd ,
_c1963.
300 _a163 ; .
504 _a
942 _cBK
999 _c262943
_d262943