G'day Guys, Gassan Sadakatsu swords are sometimes found with the inscription :   "Nihon Satetsu Kogyo Kabushiki-gaisha Motte Seiren Ko"   I think his translates roughly to  " Made using steel smelted by the Japan Iron Sand Steel Industry Company". If I have got this wrong, please correct me.  The Japan Iron Sand Steel Industry Company made sponge iron from iron sand using rotary kilns, after first treating the sand to recover vanadium. They were established around 1937 a