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公开(公告)号：US2554013A
公开(公告)日：1951-05-22
申请号：US57986445
申请日：1945-02-26
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： GROVER COOPER , WILLIAM REUSSNER , MAY FREDERICK T
IPC: H01J9/28
CPC classification number: H01J9/28
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