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公开(公告)号：US3389295A
公开(公告)日：1968-06-18
申请号：US38883964
申请日：1964-08-11
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： PIETRZYK JOHANNES P
CPC classification number: H01J19/78 , H01J21/20 , H01J2893/003
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