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ISO 21809-4 2009 Petroleum and natural gas industries External coatings for buried or submerged pipelines used in pipeline transportation systems Part 4 Polyethylene coatings (2-layer PE)
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ISO 21809-4 2009 Petroleum and natural gas industries External coatings for buried or submerged pipelines used in pipeline transportation systems Part 4 Polyethylene coatings (2-layer PE)
