00337nam a2200109Ia 4500008004100000041001200041082001700053100003600070245008200106260003200188300000700220231217s9999    xx            000 0 und d  aEnglish  a621.381  RAO  aRao, N J  Navandar, Chhaya CEDT 0aLetter symbols and graphic symbols for electrical and electronics engineering  c1990bCEDT, IIScaBangalore  a25