The X ray generator according to {HEAD ~ the second aspect} of {TAIL ~ the invention} includes a hot cathode heated by electrons which are emitted by a cold cathode electron emission source made of carbon material , so that a high voltage cable is given no large current 
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The X ray generator according to { HEAD ~ the second aspect } of { TAIL ~ the invention } includes a hot cathode heated by electrons which are emitted by a cold cathode electron emission source made of carbon material , so that a high voltage cable is given no large current
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