Source: The OSHA Oil and Gas Well Drilling and Servicing eTool, under Mousehole. URL: http://www.osha.gov/SLTC/etools/oilandgas/images/mouse_hole.jpg {{PD-USGov-DOL}}
(Source: The OSHA Oil and Gas Well Drilling and Servicing eTool, under Mousehole. URL: http://www.osha.gov/SLTC/etools/oilandgas/images/mouse_hole.jpg {{PD-USGov-DOL}})
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Transwiki approved by: w:en:User:Dmcdevit This image was copied from wikipedia:en. The original description was: == Summary == Source: The OSHA Oil and Gas Well Drilling and Servicing eTool, under Mousehole. URL: http://www.osha.gov/SLTC/etools/oila
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