General projects: manufacturing of refrigeration and air conditioning equipment; Sales of refrigeration and air conditioning equipment; Fan and fan manufacturing; Fan and fan sales; Manufacturing of special equipment for environmental protection; Sales of special equipment for environmental protection; Gas and liquid separation and purification equipment manufacturing; Gas and liquid separation and purification equipment sales; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Manufacturing of ordinary valves and cocks (excluding manufacturing of special equipment); Sales of valves and cocks; Machining of mechanical parts and spare parts; Sales of mechanical parts and spare parts; Manufacturing of glass fiber reinforced plastic products; Sales of glass fiber reinforced plastic products; Generator and generator set manufacturing; Sales of generators and generator sets; General equipment manufacturing (excluding special equipment manufacturing); General parts manufacturing; Manufacturing of distribution switch control equipment; Distribution switch control equipment sales; Special equipment manufacturing (excluding licensed professional equipment manufacturing); Enamel products sales; Security equipment sales; Security equipment manufacturing; Pump and vacuum equipment manufacturing; Sales of pumps and vacuum equipment; General mechanical equipment installation services; General equipment repair; Sales of metal products; Fire equipment sales; Door and window sales; Wholesale of hardware products; Sales of thermal insulation materials; Electrical equipment repair.