000 00297nam a2200121Ia 4500
008 220201s1973 xx 000 0 eng d
082 _bISI
100 _aI.S.I.
245 0 _aLetters symbols and sign used in electrical technology
260 _aDelhi
_bI.S.I.
_c1973
300 _a19
942 _2ddc
999 _c19316
_d19316