Search U.S. government technical reports digitized or harvested by TRAIL.
Suggestions for wiring permissible equipment
Permissible Coal-Cutting Equipment Approved Prior to July 1, 1932
List of standard starters available to prospective builders of permissible outfits
Permissible electrically operated air compressors
Permissible electrically operated room hoists
Permissible electrically operated hand-held coal drills
Permissible electrically operated post drills and drilling machines
Permissible electrically operated pumps
Inspection and testing of mine-type electrical equipment for permissibility
Permissible mine equipment approved during the calendar years 1947-49
Permissible mine equipment approved during the calendar year 1950
Permissible mine equipment approved during the calendar years 1953-54