Ключевые слова: air, area, argon, black, bottle, business, caution, construction, cylinder, cylinders, engineering, equipment, factories, factory, gases, green, group, heavy, industrial, industry, ironworks, maintenance, manufacture, many, metal, metallic, metalwork, orderly, oxygen, pipelines, place, pressure, propane, protective, regulation, regulator, repair, row, safety, safety first, shop, steel, storage, store, tank, valve, welding, work, workplace,