000
00303nam a2200109Ia 4500
008
220201s1965 xx 000 0 eng d
100
_a
Indian Standard Institute
245
0
_a
IS:3231 specification for electrical relays for power system protection
260
_b
ISI
_c
1965
300
_a
38
942
_2
ddc
999
_c
74671
_d
74671