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公开(公告)号：US1952493A
公开(公告)日：1934-03-27
申请号：US16554227
申请日：1927-02-03
Applicant: CHRISTOPH EDELMANN
Inventor： CHRISTOPH EDELMANN
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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