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公开(公告)号：US2141677A
公开(公告)日：1938-12-27
申请号：US15002237
申请日：1937-06-24
Applicant: ALLEGEMIENE ELEK CITATS GES
Inventor： WILHELM ZIEGENBEIN
IPC: H01J5/26
CPC classification number: H01J5/26 , H01J2893/0041 , Y10T403/47 , Y10T403/479
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