Ключевые слова: building, business, canister, cargo, cistern, construction, contour, drilling, energy, equipment, factory, fuel, gallon, gas, gasoline, grey, hat, icon, illustration, industrial, industry, isolated, jack, line, linear, liquid, machine, motor, oil, outline, petroleum, pipe, pipeline, plastic, power, pressure, protection, pump, railroad, railway, safety, set, tank, transportation, water, white, work,