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publicationNumber US-4926933-A
titleOfInvention Method and apparatus relating to heat exchangers
abstract A heat exchanger element in the form of a cylindrical tube with an integral external helical fin extending along at least the major part of the tube length; the integral finned tube being formed by an extrusion or injection moulding process from a rigid setting plastics material. The invention includes heat exchangers incorporating or formed by the heat exchanger elements.
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