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公开(公告)号：US2289346A
公开(公告)日：1942-07-14
申请号：US33819440
申请日：1940-05-31
Applicant: INVEX CORP
Inventor： CRAIG PALMER H , GLAUBER JOHN J
IPC: H01J17/54
CPC classification number: H01J17/54
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