ISO 21809-1-2011 Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 1 Polyolefin coatings (3-layer PE and 3-layer PP)
ISO 21809-1-2011 Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 1 Polyolefin coatings (3-layer PE and 3-layer PP)
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