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公开(公告)号：US2297492A
公开(公告)日：1942-09-29
申请号：US36984640
申请日：1940-12-12
Applicant: GUNTER MICHAELIS
Inventor： GUNTER MICHAELIS
CPC classification number: H01J43/28 , H01J5/26 , H01J21/36 , H01J2893/0043
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