Manufacturing and sales of metal packaging containers (excluding pressure vessels); steel deep processing; screen printing; sales of rails, turnouts, track supplies, signaling supplies, rubber products, and steel; R&D, manufacturing, and sales of highway maintenance equipment, snow removal equipment, municipal sanitation equipment, port equipment, railway maintenance equipment, bridge bearings, steel formwork, tunnel trolleys, rolling stock parts, steel crossbeams and anti-corrosion embedded parts, and airport maintenance equipment; house leasing; operation of goods and technology import and export; ordinary road freight transport.