{HEAD ~ The cross sectional variation} of the vapor passage in {TAIL ~ the heat pipe} between the two outermost heat transfer zones is advantageously brought about by a displacement body arranged internally of the heat pipe with a particular surface contour 
{ HEAD ~ The cross sectional variation } of the vapor passage in { TAIL ~ the heat pipe } between the two outermost heat transfer zones is advantageously brought about by a displacement body arranged internally of the heat pipe with a particular surface contour
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