bessemer converter, schematic diagram- bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace - 煉鋼 幅插畫檔、美工圖案、卡通及圖標動作
antique illustration, metallurgy: siemens furnace with gas generator for melting steel - 煉鋼 幅插畫檔、美工圖案、卡通及圖標
antique illustration of 19th century industry, technology and craftsmanship: foundry and forging, cupola oven furnace - 煉鋼 幅插畫檔、美工圖案、卡通及圖標
antique illustration of usa, pennsylvania landmarks and companies: munhall station, homestead steel works - 煉鋼 幅插畫檔、美工圖案、卡通及圖標美國, 鋼鐵廠, 美國文化
antique illustration of usa, wisconsin landmarks and companies: ashland, ashland iron and steel company - 煉鋼 幅插畫檔、美工圖案、卡通及圖標
antique illustration of usa, pennsylvania landmarks and companies: johnstown, cambria iron works - 煉鋼 幅插畫檔、美工圖案、卡通及圖標
antique illustration of 19th century industry, technology and craftsmanship: metallurgy rolling mill - 煉鋼 幅插畫檔、美工圖案、卡通及圖標工廠
