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Suggested hoisting-signal code for metal-mine shafts
Suggested hoisting-signal code for slope coal mines and for shaft mines having only one level
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Published Year
1940-1949 (2) *
Subject
Hoisting machinery (2) *
Mine hoisting--Safety appliances (2)
Mineral industries--Safety measures (2)
Coal mines and mining--Safety measures (1)
Author
East, J. H. (2)
Harrington, D. (2)
