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2. Procedures for supplying oxygen or other gases to places where welding is required, or for supplying oxygen or other gases to places used for welding, or for supplying oxygen or other gases to other equipment used for welding.
2. Procedures for supplying oxygen or other gases to places where welding is required, or for supplying oxygen or other gases to places used for welding, or for supplying oxygen or other gases to other equipment used for welding.
