Ключевые слова: acetylene, background, blue, bright, burner, business, collar, construction, copy, cut, engineering, equipment, factory, fire, flame, gas, hot, industrial, industry, isolated, job, liquid, manufacturing, metal, metallurgy, metalwork, occupation, oxygen, petrochemical, pipe, production, profession, propane, protection, protective, red, repair, safety, space, spark, steel, symbol, technology, torch, vessel, weld, welder, welding, work, worker,