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公开(公告)号：US1828346A
公开(公告)日：1931-10-20
申请号：US47257830
申请日：1930-08-02
Applicant: HANNS STAMMREICH
Inventor： HANNS STAMMREICH
CPC classification number: H01J13/28 , H01J61/58 , H01J2893/0086
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