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公开(公告)号：US2164595A
公开(公告)日：1939-07-04
申请号：US17431437
申请日：1937-11-13
Applicant: SIEMENS AG
Inventor： KARL SIEBERTZ
IPC: H01J9/12
CPC classification number: H01J9/12 , H01J2201/32 , H01J2201/34
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