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公开(公告)号：US1582849A
公开(公告)日：1926-04-27
申请号：US49494721
申请日：1921-08-24
Applicant: KARL MENSING
Inventor： KARL MENSING
CPC classification number: H01J13/00 , H01J61/58 , H01J2893/0095
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