★Ruian,Zhejiang ferrari Pin&Axle Co.,Ltd.(1990)
★★Zhejiang Sunho Pin and Axle Co., Ltd. (2000)
★★★Zhejiang Sunho Science &  Technology Co., Ltd. (2005)
★★★Wuhu  Ruiho  Electrical & Mechanical Co., Ltd. (2008)
★★★Sunho Electromechanical Co., Ltd. (2016)