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Cement grout and compressed air in shaft sinking
R. C. Johnson, in Coal Age. Description of methods and operations. (2500 w.) (No. 31921)
Cement grout and compressed air in shaft sinking
R. C. Johnson, in Coal Age. Description of methods and operations. (2500 w.) (No. 31921)
Cement grout and compressed air in shaft sinking
Compressed Air
1912
Ills.
Aufsatz (Zeitschrift)
Englisch
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Shaft sinking with chemical grout
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