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Keywords: Trench safety - guiding the trench box (9250664732).jpg Instructor demonstrating correct method of guiding the trench box into the trench https //www flickr com/photos/niosh/9250664732/ Trench safety - guiding the trench box 2010-03-17 17 16 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 N03/9250664732 2015-04-23 18 51 19 United States Government Work Construction Safety Shoring Work Workplace National Institute for Occupational Safety and Health
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