Ключевые слова: art, bright, chemical, container, contour, diesel, energy, environment, equipment, factory, fuel, gas, gasoline, generation, glowing, icon, illustration, industrial, industry, isolated, ladder, light, line, linear, lineart, liquid, natural, neon, oil, outline, petrol, petroleum, pipe, pipeline, plant, power, pump, refinery, sign, station, steel, storage, symbol, tank, technology, valve,