製鉄

N1 製法 seihou manufacturing method, recipe, formula N1 鉄鋼 tekkou iron and steel N1 鉄棒 tetsubou iron rod, crowbar, horizontal bar (gymnastics) N2 作製 sakusei manufacture, production N2 私鉄 shitetsu private railway N2 製作 seisaku manufacture, production N2 鉄橋 tekkyou iron bridge N2 鉄砲 teppou gun N3 製造 seizou manufacture, production