Ключевые слова: abstract, backgrounds, blue, business, close, closeup, construction, dirty, engine, engineer, engineering, equipment, factory, fuel, generation, heavy, indoors, industry, iron, machine, machinery, manufacturing, metal, metallic, occupation, oil, old, oldfashioned, part, part of, pipe, pipeline, pipes, power, refinery, rusty, shiny, steel, technology, tube, unhygienic, up, valve, valves, wall, wheel, working, workshop,