000 00303nam a2200121Ia 4500
008 220201s1969 xx 000 0 eng d
082 _a621.317
100 _aWarrington,C
245 0 _aProtective relays their theory & pratice
260 _bLondon:Champman & hall
_c1969
300 _a380
942 _2ddc
999 _c74956
_d74956