District field change requests for adding proximity detection systems
Series: Procedure instruction letter -- no. I12-V-19
Publisher: U.S. Department of Labor, Mine Safety and Health Adminstration
Published: 2012
Place of publication: Arlington, Virginia]
Language: eng
Subjects: Mining machinery; Safety regulations; Mine safety
Notes: Title from subject line (viewed on May 3, 2013).

"Effective Date: 07/26/2012, Expiration Date: 03/31/2014."