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公开(公告)号：US2790110A
公开(公告)日：1957-04-23
申请号：US28699752
申请日：1952-05-09
Applicant: APPLEGATE CHARLES J
Inventor： APPLEGATE CHARLES J
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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