File:30 CFR 1993 Page 33.png

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English: Illustration from page 33 of Figure D-1.
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Author Mine Safety and Health Administration
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This work is in the public domain in the United States because it is a work of the United States Department of Labor under the terms of Title 17, Chapter 1, Section 105 of the US Code and the DOL copyright policy. See Copyright.

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Category:PD US DOL#30%20CFR%201993%20Page%2033.png
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