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| Keywords: Trench safety - lifting a properly rigged trench box (9247877887).jpg A backhoe lifting a properly rigged trench box https //www flickr com/photos/niosh/9247877887/ Trench safety - lifting a properly rigged trench box 2010-03-17 11 38 https //www flickr com/people/25069384 N03 National Institute for Occupational Safety and Health NIOSH from USA PD-USGov NIOSH http //flickr com/photos/25069384 N03/9247877887 2015-04-23 18 51 17 United States Government Work Construction Safety Shoring Work Workplace National Institute for Occupational Safety and Health | ||||
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