A system is provided for predicting a load degree of a customer's elevator from the information about the customer's building and elevator, creating and displaying the maintenance plan according to the load degree, and selecting a proper maintenance plan in consideration of the load degree of the customer's...http://www.google.com.tw/patents/US7194415?utm_source=gb-gplus-share專利 US7194415 - Support system for maintenance contract of elevator
