| http://www.w3.org/ns/prov#value | - Enclosure 75 may be formed of any suitable thermally conductive material, such as aluminum or the like for instance, and has a plurality of walls or wall means 79 for defining therewithin a chamber 81 which is communicated with the interior of housing 71 through an opening 83 in flat faced end shield 73; therefore, the chamber is subjected to at least some of the cooling air circulated within at l
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