00297nam a2200121Ia 4500008004100000041001200041082001600053100001700069245002300086260003500109300000800144650002300152231217s9999    xx            000 0 und d  aEnglish  a671.52  KHA  aKhanna, O P. 0aWelding technology  c1993bNew Delhi : Dhanpat Rai,  a760  aWelding technology