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公开(公告)号：US2847699A
公开(公告)日：1958-08-19
申请号：US34596253
申请日：1953-03-31
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： DANIEL MULLAN , ZILAHY EDWARD Z
IPC: H01J9/30
CPC classification number: H01J9/30
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