Automatic derailing switch at Roslyn No. 3 mine, Northwestern Improvement Company, Roslyn, Wash.

Bibliographic Details
Corporate Author:	Northwestern Improvement Company
Other Authors:	Ash, S. H. (Simon Harry), 1889-, Kudlich, Rudolf H., 1883-
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : [publisher not identified], 1930.
Series:	Mines Bur. Info. Circ. No. 6226
Subjects:	Mine safety > Equipment and supplies. Electronic books.
Online Access:	Connect to the full text of this electronic document

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