45112000-5 Excavating and earthmoving work 45231100-6 General construction work for pipelines 45231110-9 Pipelaying 45231300-8 Construction work for water and sewage pipelines 45231400-9 Construction work for electricity power lines 45232140-5 District-heating mains 45232150-8 Works related to water-distribution pipelines 45232411-6 Foul-water piping
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