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"Modernization" is a comprehensive renewal of an old elevator system in order to improve its safety, functions and design, any elevator system, similar to other building equipment, comes to the end of its service life even if and appropriate maintenance is done. As years pass by, it becomes more difficult to get parts, causing you inconvenience such as longer lead time of manufacturing, or longer down time of the elevator system. In addition, function of elevator and safety standard are changing year after year due to the change of social environment.