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公开(公告)号：US1652921A
公开(公告)日：1927-12-13
申请号：US11968326
申请日：1926-06-30
Applicant: LEOPOLD WIMBERGER
Inventor： LEOPOLD WIMBERGER
CPC classification number: H01J13/34 , H01J13/48 , H01J2893/0087
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