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The top documents tagged [vertical shafts]
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vertical shafts
History Of Mining 1. Some primitive mining activity occurred during the stone age when Neolithic Man exploited flint deposits. Some of these early flint.
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LOUISIANA DEPARTMENT OF PUBLIC SAFETY AND CORRECTIONS OFFICE OF STATE FIRE MARSHAL, CODE ENFORCEMENT AND BUILDING SAFETY 2002 NFPA 13:8.14 SPECIAL SITUATIONS.
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allowable speed
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