Search U.S. government technical reports digitized or harvested by TRAIL.
Requirements for bolts and similar fastenings for permissible electrical equipment
The splicing of rubber-sheathed trailing cables
Data in reference to installation of cables in shafts and boreholes
List of motors available to prospective builders of permissible outfits
250 versus 500 volts or more for circuits in gassy coal mines
Rubber-Sheathed Trailing Cables
Evolution of methane detecting devices for coal mines
An international viewpoint on safeguarding electrical equipment used in gassy mines
List of permissible mine equipment
Permissible Coal-Cutting Equipment Approved Prior to July 1, 1932
List of permissible mine equipment
Milestones in mine-safety legislation
Permissible electrically operated air compressors
The improved permissible flame safety lamps
Permissible Electric Mine Lamps (Supplement to Bulletin 332)
List of permissible mine equipment :approved to January 1, 1937
Permissible electrically operated room hoists
Permissible electrically operated hand-held coal drills
List of permissible mine equipment approved during 1937
Permissible electrically operated post drills and drilling machines
Fatal and nonfatal electrical accidents in coal mines
State regulations pertaining to hoisting of men
Inspection and maintenance of mine hoisting ropes
Investigation of electrical equipment, safety lamps, and gas detectors for safety
Permissible electrically operated pumps
List of permissible mine equipment approved to January 1, 1940
A quarter century of mechanized mining:notes on permissibility
List of permissible mine equipment approved to January 1, 1942