00279nam a2200109Ia 4500008004100000041000800041082001900049100001600068245003700084260004000121300000800161211209s1994    xx            000 0 und d  aeng  a671.52 N94 KHA  aKHANNA, O P  aTEXT BOOK OF WELDING TECHNOLOGY   aNEW DELHIbDHANPAT RAI & SONSc1994  a763