| http://www.w3.org/ns/prov#value | - In a combination as set forth in claims 68,the circulating means including a hose, a high voltage lead disposed in the hose, and coupling means at the end of the hose for coupling the hose to the housing, the high voltage lead being coupled into the housing for introduction to the cathode when the hose is coupled to the housing, and means for grounding the high voltage lead when the hose is not co
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