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A Safety Code for Elevators, Dumbwaiters and Escalators
American Society of Mechanical Engineers
其他書名
First Revision; Rules for Construction, Inspection, Maintenance and Operation
出版Amer. Soc. of Mech. Engineers, 1925
URLhttp://books.google.com.hk/books?id=6jFQAQAAMAAJ&hl=&source=gbs_api