Door OperatorsDoor Reversal Devices: 1930-1960By Dr. Lee Gray | May 1, 2014Fred Anzley Annett (1879-1959), author of Electric Elevators: Their Design, Construction, Operation and Maintenance, provides a critical framework for this introductory history of elevator-door reversal devices.
SafetyReport Released on Use of Lifts for Evacuation from High RisesBy reprinted from Liftinstituut Magazine | May 1, 2014
EngineeringGrid-Connected Feedback ControlBy Wang Yanqing, Jiang Qing, Cao Jie and Wan Jianru | May 1, 2014