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Automatic Derailing Switch at Roslyn No. 3 Mine, Northwestern Improvement Company, Roslyn, Wash
Simon Harry AshRudolf H. Kudlich
出版U.S. Department of Commerce, Bureau of Mines, 1930
URLhttp://books.google.com.hk/books?id=TguPz-f_MKAC&hl=&source=gbs_api
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