Procedure for Applying for Tests Made on All Explosives and Blasting Devices by the Explosives Division of the Bureau of Mines; Prescribed Conditions and Requirements for Permissibility when Used in Coal Mines and Schedule of Fees for the Tests, Approved September 18, 1939

Procedure for Establishing a List of Permissible Storage-battery Locomotives for Use in Gaseous Mines: Character of Tests, Conditions Under which Battery-storage Locomotives Will be Tested, and Fees [approved] November 1919

Permissible Telephones and Signaling Devices, Requirements for Permissibility, Tests Made, and Fees Charged, Approved October 25, 1938

Procedure for Testing Supplied-air Respirators for Permissibility, Approved August 9, 1937

Procedure for Establishing a List of Permissible Telephones for Use in Coal Mines, [approved] December 5, 1922

Procedure for Establishing a List of Permissible Electric Switches and Junction Boxes for Use at the Outer End of Trailing Cables: Fees, Character of Tests, and Conditions Under which Tests and Inspections Will be Made. [Approved] May 1922

Procedure for Establishing Lists of Permissible Flame Safety Lamps and Methane Detectors of the Flame Type; Conditions Under which Tests Will be Made; Requirements for Approval; Fees. [approved] September 19, 1922

Procedure for Testing Explosives for Permissibility for Use in Gaseous and Dustry Coal Mines with Test Requirements, Tolerance Limits, and the Schedule of Fees [approved] April 8, 1921

Single-shot Blasting Units: Requirements for Permissibility Tests Made, and Fees Charged, Approved July 16, 1940

Procedure for Establishing a List of Permissible Single-shot Blasting Units, Character of Tests, Conditions Under which the Units Will be Tested, and Fees [approved] April 11, 1919

Procedure for Establishing a List of Permissible Multiple-shot Blasting Machines: Character of Tests, Conditions Under which the Machines Will be Tested, and Fees, [approved] June 25, 1920

Preliminary Classified Index of Technical Oil Mission Reels 1-259 and 273-279

Procedure for Testing Gas Masks for Permissibility

Procedure for Establishing a List of Permissible Electric Hand Lamps, Trip Lamps, Animal Lamps, and Rescue Lamps for Use in Gaseous Mines: Fees, Character of Tests, and Conditions Under which Tests and Inspections Will be Made [approved] February 2, 1922

Portable Methane Detectors: Requirements for Permissibility, Tests Made, and Fees Charged

Procedure for Establishing a List of Permissible Electric Motors, Fees, Character of Tests, Conditions Under which Tests and Inspections Will be Made, [approved] August 16, 1921