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Some Haulage Safety Devices for Use on Grades, Slopes, and Inclined Shafts

George Wallace GroveSimon Harry AshErnest John Ristedt

出版	U.S. Government Printing Office, 1942
URL	http://books.google.com.hk/books?id=p4GihjEao0IC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN