Otis Elevator Company is one of the leading manufacturers and installers of elevators, escalators and moving walkways in the world. It serves clients in more than 200 countries. The company maintains a staff of over 61,000 employees. Otis Elevator Company operates manufacturing facilities in the United States, Europe and Asia. It has annual sales revenue of nearly $12.5 billion. The company offers machine roomless and gearless traction elevators. Otis Elevator Company provides a range of repair and maintenance services. It has competed projects for Petronas Twin Towers, Luxor Hotel and Sazka Arena. The company maintains a subsidiary, Sigma Elevator Singapore.