Ключевые слова: abstract, aluminum, background, black, build, business, canalization, circle, closeup, construction, craftsmanship, culvert, ditch, drainage, ducts, end, face, frame, group, housing, illustration, industrial, industry, iron, line, manufacturing, materials, metal, new, objects, pattern, piled, pipe, pipeline, plastic, plumbing, product, pvc, repair, round, snow, stack, steel, storage, technology, tube, wall,