Ключевые слова: aged, alte, box, brackets, brick, building, building exterior, built structure, cellar, condominium, construction, dirty, door, energy, europe, exterior, fixed, fossil fuel, gas, gas meter, gaz, house, hydraulic, industrial, industry, italy, metal, meter, methane, natural gas, outdoors, pipe, pipeline, plaster, power, propane, protection, protective, rusty, safety, steel, technology, tube, varnished tubes, wall, water, water pipe,