acetylene torch smelting hot precious metals, macro close up with copy space 乙炔 鋁 鋁 Acetylene torch smelting hot precious metals down
acetylene torch smelting hot precious metals, macro close up with copy space 乙炔 鋁 鋁 Acetylene torch smelting hot precious metals down
acetylene torch smelting hot precious metals, macro close up with copy space 乙炔 鋁 鋁 Acetylene torch smelting hot precious metals down
acetylene torch smelting hot precious metals, macro close up with copy space 乙炔 鋁 鋁 Acetylene torch smelting hot precious metals down
acetylene torch smelting hot precious metals, macro close up with copy space 乙炔 鋁 鋁 Acetylene torch smelting hot precious metals down
acetylene torch smelting hot precious metals, macro close up with copy space 乙炔 鋁 鋁 Acetylene torch smelting hot precious metals down
A man helping to train women war workers in acetylene welding, USA, circa 1943. (Photo by FPG/Archive Photos/Getty Images) 垂直 黑色和白色 檔案 Acetylene Welding