/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: LeeEC https://cdn.slidesharecdn.com/profile-photo-LeeEC-48x48.jpg?cb=1481531654 If you have any interesting topic or problems related to elevators design or manufacturing, you may share it with me。