00282nam a2200097Ia 450000500170000000800410001705000140005810000170007224500570008926000380014620251229182356.0251229s9999    xx            000 0 und d  aTT 211 G8  aGupta, R. C. 0aWelding engineering science &metallurgy.cR. C Gupta  aNewdelhib S. chand &co ltdc1989