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abrasive wheels air line respirators amended at 32 America Standard Safety arc welding atmosphere boiler cable chain chemical circuit Cleats compartment competent person concentration confined space crane cutting and heating cutting or heating electric employees enclosed spaces ensure exposed extension trestle ladder feet filter flammable liquids fuel gas gangway gas cylinder gases gear hazard hoisted hooks hose immediately dangerous inch lumber inspected Jacob's ladder less lower explosive limit material means of access mechanical ventilation meeting the requirements ments metal operations oxygen paint percent performed permitted pipe Platform planking portable precautions preservative coatings pressure vessels regulations removed requirements of paragraph respirators in accordance respiratory protective equipment Safe For Fire safe working load scaffolds secured Ship's side rails slings solvents Splice stirrups subparagraph Subpart suitable surface tanks tests threshold limit value tion toxic U.S. Coast Guard vapors welding and cutting WIRE ROPE wrought iron