Our management experience has successfully passed the ISO9001, ISO14001 and ISO18001 system certification. Meanwhile, HENGTONG can produce many kinds of bare overhead conductors satisfy with GB、IEC、ASTM. The cable is widely used in elevator car and control room for transmitting power, signal and image. It can effectively improve and expand the transmission characteristics of communication line, reduce system manufacturing and installation costs. As the ever accelerating urbanization process of China, more and more high-rise office buildings and hotels are built, which brings a huge demand for super-high speed and large capacity elevators, bringing convenience both to daily life and work.