Ключевые слова: apparatus, background, burner, close, component, connection, construction, detail, engine, engineering, fitting, gas, gear, hydraulic, industrial, industry, iron, lines, machine, machinery, manufacturing, mechanic, mechanical, mechanism, metal, motor, nozzle, part, pipe, pipeline, piping, plastic, plumbing, power, science, steel, structure, technology, transportation, tube, valve, water,