... meets te standard of GB16899-97 exquisite structure,consummate step,smart railing,pleasing outine model,smooth running,easy maintenance ... of Escalator:Ø The truss utilizes first class angle steel with unique structre,high strength and complete durable features.Ø The ... the accuracy of steps.Ø The large size dimeter of step roller with stable running,low noise and long lifetime.Ø The human ...