drag flight elevator

moving staircase... ... double elevator 双列(斗式)升运器 drag-flight elevator 刮板式升运器 drum elevator 滚筒式升运机 ...

... elevator flight scraper 自行式升运链板铲运机 drag-flight elevator 刮板升运器 rubber-flight elevator 橡皮刮板式升运器 ...