Ключевые слова: building, circular, concrete, confined, construction, cut, cutter, engineering, equipment, factory, fire, flame, flash, gas, grinder, handbook, heat, hot, if you, industrial, iron, job, light, machine, man, manufacture, mask, men at work, metal, metalwork, occupation, pipe, power, precision, production, protection, repair, safety, sparks, steel, structure, technical, technology, tool, welder, welding, work, worker, working, workshop,