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Plastic pipe prodn., used for gas-gas heat exchanger - by dividing pipe section of partially crystalline plastic in to sections, forming outer cone section at one end and collar section at other end, etc.
Heftnadel aus Kunststoff, insbesondere aus einem faserverstärken Kunststoff, für eine Verbindungsvorrichtung zum temporären Verbinden von wenigstens zwei vorzugsweise plattenartigen Teilen