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

Published Year

• 1930-1939 (1)

Subject

• Mine safety--Washington (State) (1) *
• Mines and mineral resources--Washington (State) (1)

Author

• Ash, S. H. (1) *
• Kudlich, Rudolf H., (1)

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