More particularly, the disclosure relates to {HEAD ~ X ray generating devices} and X ray exposure apparatus in which {TAIL ~ various components} provided in a vacuum chamber housing the X ray generating device can be replaced easily for maintenance and other purposes 
More particularly , the disclosure relates to { HEAD ~ X ray generating devices } and X ray exposure apparatus in which { TAIL ~ various components } provided in a vacuum chamber housing the X ray generating device can be replaced easily for maintenance and other purposes
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