Mechanical and electrical equipment manufacturing; Pump and vacuum equipment manufacturing; Pump and vacuum equipment sales; Processing of mechanical parts and parts; Sales of power electronic components; Artificial intelligence industry application system integration services; Mining machinery sales; Sales of special equipment for environmental protection; General equipment manufacturing (excluding special equipment manufacturing); Sales of gears and gearboxes and gearboxes; Sales of machinery and equipment; Sales of special equipment for oil drilling and production; Wholesale of hardware products; Sales of metal materials; Sales of mechanical parts and parts.