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公开(公告)号：US1930829A
公开(公告)日：1933-10-17
申请号：US55020331
申请日：1931-07-11
Applicant: SIEMENS AG
Inventor： MAX STEENBECK
IPC: H01J13/48
CPC classification number: H01J13/48 , H01J2893/0058
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