Iron making Technology-Kodumanal Swords

Kodumanal Swords
I dont understand what is kodumanal swords. Somehow the term is alive.
One korean has written in his blogger. I am wondering , how does this happne?

One thing is damn sure that, the kodumanal has done lot of thigs earlier days which we haven't digged it still..



Iron making Technology:


Production of pig iron, cast iron, and wrought iron in ancient India. Delhi and Dhar iron pillar, forge welding, lamination, paint coating for preventing rusting. Making of swords, the Banaras and Kodumanal swords, carburization in iron instruments used in agriculture and surgery. Rust free preservation techniques adopted for iron, woortz steel. Large scale production of iron alloys, export of iron to European and Middle East countries etc.


Sources From:http://j2k.naver.com/j2k_frame.php/japan/anuraglall.blogspot.com/