Manufacture of electronic measuring instruments; Manufacture of railway locomotive and rolling stock parts; Manufacture of high-speed rail equipment and accessories; Manufacture of specialized railway measuring or testing instruments; Manufacture of instruments and meters; Sales of specialized equipment, key systems and components for rail transit; Metrology technical services; Manufacture of industrial control computers and systems; Leasing of mechanical equipment; Rental of non-residential real estate; Import and export of goods; Import and export of technologies