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公开(公告)号：US2154264A
公开(公告)日：1939-04-11
申请号：US17894337
申请日：1937-12-09
Applicant: SIEMENS AG
Inventor： WALTER DAMITZ
IPC: H01J13/02
CPC classification number: H01J13/02 , H01J2893/0073
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