Introduction to “Dissection of Blast Furnaces and Their Inside State (Report on the Dissection of Blast Furnaces-1), Tetsu-to-Hagane, 62 (1976), pp.535-546 by Kenjiro Kanbara, Tomoro Hagiwara, Akitoshi Shigemi, Shin-ichi Kondo, Yuji Kanayama, Ken-ichi Wakabayashi and Nobuyoshi Hiramoto”