Otis Elevator Company is one of the largest manufacturers of escalators. It provides a variety of service and freight elevators. With annual revenue of more than $11.5 billion, the company offers a range of moving walkways for hospitals and houses. Otis Elevator Company provides replacement parts and maintenance management systems. The company maintains manufacturing facilities in North America, South America, Europe and Asia. It employs over 53,000 professionals and provides repair and maintenance services to customers in nearly 200 countries. Otis Elevator Company has engineering facilities in the United States, China, France, Germany, Japan, Korea and Spain. Its customers include architects, contractors, developers and homeowners. The company is a part of United Technologies Corporation.