The registration address of changsayan instrumentation equipment, ltd., is located in room 201, a5, 6th zhuong street plumbe, district of hunan province, on the 2nd floor, with registration as the new district management committee of hunan zhongjiang, with legal representatives operating in yellow wave, covering instruments, general-purpose equipment, repair of metal products; study of teaching equipment, development of basic software; teaching instruments, laboratory kits and ventilation systems, electrical and pedagogic training equipment, glass instruments, educational equipment, scientific testing instruments, mechanical and electrical products, general-purpose instruments and instruments; development of industrial automation equipment, chemical products, electronic and electrical products; wholesale distribution of hardware, chemical products; design, development of environmental equipment; installation of petrochemical equipment; and maintenance of computers, office equipment ...