000 00286nam a2200121Ia 4500
008 220201s1969 xx 000 0 eng d
082 _bISI
100 _aI.S.I.
245 0 _aGraphical symbols used in electrotechnology
260 _aDelhi
_bI.S.I.
_c1969
300 _a13
942 _2ddc
999 _c19337
_d19337