... weight more than aluminumb).Aluminium alloy Step: Surface bright, Light weight, High strength, Corrosion resistance, Easy to clean and ... lubricating system (as custome's request);c).The indicator light of operation direction. (Intelligent machine must be have or as ... (over-speed, under-speed) (Optional function)e).The function of failure display; VI. Qualification Profile:1. SEPROS provides escalators, ...