1, Neffens klassifikaasje fan produksjemetoaden (1) Naadleaze Pipe - Hot-Rolled Pipes, Cold-Rolled Pipes, Cold-Drawn tubes, Extruded tubes, Pipe Jacking (2) Welded Pipe (A) yn oerienstimming mei sub-Processen Pipe, ERW Pipe (High Frekwinsje, lege frekwinsje), Gas Pipe, Furn ...
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