Machining of mechanical parts; manufacturing of specialized production vehicles; wholesale of auto parts; wholesale of building materials; retail of hardware; retail of general merchandise; wholesale of other machinery and electronic products; general equipment repair; loading and unloading; leasing of construction machinery and equipment; self-owned real estate activities; road cargo transport (excluding dangerous cargo transport); cargo port loading, unloading, and warehousing services (excluding storage and loading/unloading of chemical dangerous goods); earth and stone works (excluding blasting); export of self-produced products and import of machinery, parts, and raw materials required by the enterprise (without separate import/export commodity catalog), except those restricted or prohibited by the state.