Ключевые слова: background, black, circuit, circular, detail, engineering, gasket, groove, hole, hydraulic, industrial, industry, isolated, machine, machinery, mechanical, mechanism, metal, nuts, object, oil, part, parts, pressures, pump, radial, repair, replacement, ring, rotary, round, rubber, seal, service, shaft, shine, shiny, spring, steel, system, technical, technics,