37
Oil and gas pipeline construction; pipeline installation, maintenance and repair; construction project management services; oil and gas pipeline construction planning; advisory and consultancy services relating to all the aforesaid services
40
Oil and gas pipeline fabrication for others; welding for pipeline fabrication, construction, maintenance and repair; consultation in the field of oil and gas pipeline fabrication and welding
42
Technological consultation, analysis and research in the technology field of oil and gas pipelines; engineering services; engineering project management; engineering analysis services; oil and gas pipeline safety testing, inspection and evaluation services; oil and gas pipeline inspection services; advisory and consultancy services
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