Ключевые слова: abstract, background, beam, black, building, circle, closeup, commerce, connection, construction, detail, drain, drainage, duct, electrical, engineering, equipment, factory, industrial, industry, line, manufacture, material, new, object, pattern, pipe, pipeline, piping, plastic, plumber, plumbing, pvc, roll, round, sewage, sewer, stack, storage, store, structure, supply, technology, texture, toilet, tube, tubing, warehouse, work,