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Plastics pipes having walls with lengthwise extending channels










Image Number 3 for United States Patent #4341392.

Plastic pipes comprising an inner and outer wall being interconnected by lengthwise extending connecting partitions, forming channels, the ends of the channels being each separately sealed by sealingly pressing the end walls of a channel to each other after these walls have been heated to a temperature surpassing the plasticizing temperature.








 
 
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