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公开(公告)号：US3551734A
公开(公告)日：1970-12-29
申请号：US3551734D
申请日：1968-12-18
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： O'KEEFFE TERENCE W , VINE JAMES
CPC classification number: H01J9/233 , H01J29/46 , H01J29/50 , H01J37/06 , H01J37/141 , H01J37/21 , H01J37/30 , H01J2229/505
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