Ключевые слова: access, accessible, architecture, background, basic, city, cover, design, emergency, energy, energy supply, equipment, germany, hidden, infrastructure, maintenance, metal, municipal, municipal utilities, pattern, pavement, paving stone, repair, road, road cap, roadway, sandstone, security, service, shaft, shaft cover, sidewalk, slide box, slide cap, stones, supply, supply line, technology, texture, urban, water, water supply,