Procedure for permitting the use of belt air to ventilate working sections of underground coal mines
Series: Procedure instruction letter -- no. I12-V-14
Publisher: U.S. Department of Labor, Mine Safety and Health Adminstration
Published: 2012
Place of publication: Arlington, Va.]
Language: eng
Subjects: Mine ventilation; Equipment and supplies; Safety regulations; Mine atmospheres; Safety measures
Notes: Title from subject line (viewed on July 1, 2013).

"Effective Date: 05/07/2012, Expiration Date: 03/31/2014."

"Reissue of I10-V-06."