{HEAD ~ The X ray generator} according to the second aspect of 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 {TAIL ~ a high voltage cable} is given no large current 
{ HEAD ~ The X ray generator } according to the second aspect of 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 { TAIL ~ a high voltage cable } is given no large current
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