Ключевые слова: art, background, bolt, chemical, color, conduit, connection, construction, control, element, engineering, equipment, factory, faucet, fuel, gas, gasoline, icon, illustration, industrial, industry, isolated, metal, natural, object, oil, petroleum, pipe, pipeline, piping, plumbing, pop, popart, poster, power, pressure, pump, retro, sign, steel, style, symbol, system, tap, technology, tube, valve, vintage, water,