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Sinking and concreting deep mine shaft
Lining and walls of four compartment shaft, 936 ft. deep, concreted simultaneously with excavation operations.
Sinking and concreting deep mine shaft
Lining and walls of four compartment shaft, 936 ft. deep, concreted simultaneously with excavation operations.
Sinking and concreting deep mine shaft
Contract Rec
1919
4 pages
4 Figs.
Article (Journal)
English
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