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  • Suggestions for design of electrical accessories for permissible mining equipment [microform]

    • Text
    • [Washington?] : U.S. G.P.O., 1926.
    • 1926

  • Inspection and testing of mine-type electrical equipment for permissibility [microform]

    • Text
    • [Washington?] : U.S. G.P.O., 1929.
    • 1929

  • Permissible storage-battery locomotives and power trucks [microform]

    • Text
    • [Washington?] : U.S. G.P.O., 1929.
    • 1929

  • Permissible coal-handling equipment, approved from Jan. 1926 to Dec. 1930, inclusive [microform]

    • Text
    • [Washington?] : U.S. G.P.O., 1931.
    • 1931

  • Maintenance of electrical mine equipment from viewpoint of safety inspector [microform]

    • Text
    • [Washington?] : U.S. G.P.O., 1932.
    • 1932

  • Guarding trolley wires in mines [microform]

    • Text
    • Washington, D.C. : [s.n.], 1932.
    • 1932

  • Notes pertaining to safety inspections of permissible electric mine equipment [microform]

    • Text
    • Washington, D.C. : [s.n.], 1932.
    • 1932

  • Data in reference to installation of cables in shafts and boreholes [microform]

    • Text
    • Washington, D.C. : [s.n.], 1932.
    • 1932

  • Study of gauze heating in miners' flame safety lamps [microform]

    • Text
    • Washington, D.C. : [s.n.], 1929.
    • 1929

  • Abnormal pressures in explosion-proof compartments of electrical mining machines [microform]

    • Text
    • Washington, D.C. : [s.n.], 1929.
    • 1929

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