Ключевые слова: 3d, abstract, bolt, chemical, connection, draw, drawing, element, energy, engineering, equipment, facility, factory, faucet, fitting, flange, fuel, gas, gasoline, graphic, handle, heavy, illustration, industrial, industry, line, manufacturing, oil, outline, pairs, perspective, pipe, pipeline, piping, plant, plumbing, rotate, shut, silhouette, sketch, technology, thread, tube, valve, wire frame, wireframe,