Tractor manufacturing; agricultural machinery manufacturing; household appliance manufacturing; mechanical equipment research and development; pneumatic and electric tool manufacturing; general equipment manufacturing (excluding special equipment manufacturing); hardware product manufacturing; generator and generator set manufacturing; motor manufacturing; battery manufacturing; non-electric household appliance manufacturing; off-highway recreational vehicle and spare parts manufacturing; motorcycle spare parts manufacturing; bicycle manufacturing; security equipment manufacturing; door and window manufacturing and processing; sporting goods and equipment manufacturing; arts and crafts and gifts Manufacturing of instrument products (except ivory and its products); sales of agricultural machinery; sales of machinery and equipment; sales of electric bicycles; wholesale of motorcycles and spare parts; sales of generators and generator sets; sales of off-highway recreational vehicles and spare parts; sales of pneumatic and electric tools; sales of non-electric household appliances; sales of household appliances; sales of doors and windows; sales of fire-fighting equipment; sales of arts and crafts and ceremonial items (except ivory and its products); real estate brokerage; import and export of goods; import and export of technology.