| http://www.w3.org/ns/prov#value | - (a) a tube; (b) a sleeve comprising a sputtering material, said sleeve having an inside diameter greater than the outside diameter of said tube and surrounding said tube in such a manner as to form an annular space between the outside surface of said tube and the inside surface of said sleeve; (c) a thermally conductive material at least partially occupying said annular space, said material compri
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