金属産業
alchemy
assembly line
automated production line
building industry
cast iron melt
casting factory
construction
dangerous
east factory
energy
flame
furnace
hot sparks
industry
man
manufacturing machine
metal
metallurgical industry workers
protection
safety
steel
steel mills
steel workers
the concept of safety helmet
the iron and steel
the iron helmet
the melt
the molten steel
the workplace
work
workshop