00255nam a2200097Ia 4500008004100000100001500041245003500056250001300091260004500104300000800149191201s2011    xx            000 0 und d  aKHANNA, OP 0aTextbook of Welding Technology  a20th Rep  c2011bDhanpat Rai Pub (P) LtdaNEW DELHI  a944