Ключевые слова: background, blue, bolt, business, chain, construction, control, energy, engineering, environment, equipment, factory, fire, flow, flowing, fuel, gas, industrial, industry, lock, main, manufacturing, metal, meter, natural, off, oil, old, open, outdoors, outside, painted, pipe, pipeline, plant, plumbing, power, pump, red, shut, sprinkler, steel, supply, technology, tube, valve, valves, water, well, wheel,