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公开(公告)号：US2418305A
公开(公告)日：1947-04-01
申请号：US53071344
申请日：1944-04-12
Applicant: ITTNER CHARLES K
Inventor： ITTNER CHARLES K
IPC: H01J13/14
CPC classification number: H01J13/14 , H01J2893/0082
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