Over the last decade, with the deepening of China's reform and opening-up policy implementation, with the rapid development of economic construction and people's living standards, promote the rapid development of the construction industry, with the simultaneous development of the construction of lifts and service elevator design manufacture, installation transformation maintenance, management and use of practitioners is rapidly grow up team is currently running the country lifts hundreds of thousands of units, newly installed elevators also on the rise, and as the elevator drive components and safety parts, traction machine and the speed limit device is the most important.

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