Gas and liquid separation and purification equipment manufacturing; gas and liquid separation and purification equipment sales; gas compression machinery manufacturing; gas compression machinery sales; hydraulic power machinery and components manufacturing; hydraulic power machinery and components sales; lubricating oil sales; general equipment manufacturing (excluding special equipment manufacturing); ecological environment material manufacturing; ecological environment material sales; pneumatic power machinery and components manufacturing; pneumatic power machinery and components sales; railway locomotive and rolling stock parts manufacturing; railway locomotive and rolling stock parts sales; pump and vacuum equipment manufacturing; pump and vacuum equipment sales; environmental protection special equipment manufacturing; environmental protection special equipment sales; goods import and export; technology import and export.