| http://www.w3.org/ns/prov#value | - Unlike the first embodiment of the invention where individual heat pipes contain the capillary structure and the working fluid, the inside surface of the cylinder wall of the second embodiment is preferably lined with a capillary structure (e.g., grooves, wires, wicking material or other material serving a capillary function), and the cylinder itself is adapted to receive and contain the working f
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